Publications

Keywords

cryptography, information security, digital trust, digital signatures, public-key infrastructure, electronic identity, electronic documents, post-quantum cryptography, finite fields, artificial intelligence security

PT · EN · ES

My publication record spans cryptography, public-key infrastructure, digital signatures, electronic documents, digital identity, post-quantum cryptography, and earlier research in computing, networks, and signal analysis.

The bibliography is organized around canonical scholarly works. A conference paper, journal version, preprint, or ePrint belonging to the same scholarly contribution is therefore consolidated as one work, while the individual bibliographic manifestations remain accessible.

Selected Publications

A curated selection of publications that mark significant stages in my research trajectory.

OpenHSM: An Open Key Life Cycle Protocol for Public Key Infrastructure's Hardware Security Modules

Jean Everson Martina, T\'ulio Cicero Salvaro de Souza, Ricardo Felipe Cust\'odio

Public Key Infrastructure, 4th European PKI Workshop: Theory and Practice, EuroPKI 2007, Palma de Mallorca, Spain, June 28-30, 2007, Proceedings, 2007

Key lifecycle management and open protocols for PKI hardware security modules.

Public-Key Infrastructure Cryptography

Conference paper · preferred

Audit and backup procedures for hardware security modules

T\'ulio Cicero Salvaro de Souza, Jean Everson Martina, Ricardo Felipe Cust\'odio

IDtrust 2008, Proceedings of the 7th Symposium on Identity and Trust on the Internet, March 4-6, 2008, Gaithersburg, Maryland, USA, 2008

Auditability, backup, and operational assurance for hardware security modules.

Digital Identity

Conference paper · preferred

Optimized Certificates - A New Proposal for Efficient Electronic Document Signature Validation

Ricardo Felipe Cust\'odio, Mart\'\in Augusto Gagliotti Vigil, Juliano Romani, Fernando Carlos Pereira, Joni da Silva Fraga

Public Key Infrastructure, 5th European PKI Workshop: Theory and Practice, EuroPKI 2008, Trondheim, Norway, June 16-17, 2008, Proceedings, 2008

Efficient certificate design for electronic document signature validation.

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Cleaning up the PKI for Long-term Signatures

Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio

XII SBSeg 2012, 2012

Simplifying PKI mechanisms for the long-term validation of digital signatures.

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

The Notary Based PKI - A Lightweight PKI for Long-Term Signatures on Documents

Mart\'\in Augusto Gagliotti Vigil, Cristian Thiago Moecke, Ricardo Felipe Cust\'odio, Melanie Volkamer

Public Key Infrastructures, Services and Applications - 9th European Workshop, EuroPKI 2012, Pisa, Italy, September 13-14, 2012, Revised Selected Papers, 2012

A lightweight notary-based PKI model for long-term document signatures.

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred Conference paper

A Verifiable Voting Protocol Based on Farnel

Roberto Ara\'ujo, Ricardo Felipe Cust\'odio, Jeroen van de Graaf

Towards Trustworthy Elections, New Directions in Electronic Voting, 2010

Verifiable electronic voting using the Farnel approach.

Electronic Voting Cryptography

Conference paper · preferred IACR ePrint

A User-Centric Digital Signature Scheme

Felipe Carlos Werlang, Ricardo Felipe Cust\'odio, Mart\'\in Augusto Gagliotti Vigil

Public Key Infrastructures, Services and Applications - 10th European Workshop, EuroPKI 2013, Egham, UK, September 12-13, 2013, Revised Selected Papers, 2013

A user-centric approach to digital signatures and electronic documents.

Digital Signatures Public-Key Infrastructure Cryptography

Conference paper · preferred

Tuning the Winternitz hash-based digital signature scheme

Lucas Pandolfo Perin, Gustavo Zambonin, Douglas Marcelino Beppler Martins, Ricardo Felipe Cust\'odio, Jean Everson Martina

2018 IEEE Symposium on Computers and Communications, ISCC 2018, Natal, Brazil, June 25-28, 2018, 2018

Optimization of Winternitz hash-based signatures and a bridge to post-quantum research.

Post-Quantum Cryptography Digital Signatures Cryptography

Conference paper · preferred

Post-Quantum Electronic Identity: Adapting OpenID Connect and OAuth 2.0 to the Post-Quantum Era

Frederico Schardong, Alexandre Augusto Giron, Fernanda Larisa M\"uller, Ricardo Cust\'odio

Cryptology and Network Security - 21st International Conference, CANS 2022, Dubai, United Arab Emirates, November 13-16, 2022, Proceedings, 2022

Post-quantum adaptation of widely deployed electronic identity protocols.

Post-Quantum Cryptography Digital Identity Cryptography

Conference paper · preferred

Browse by Research Area

Digital Identity 20 Digital Signatures 20 Electronic Documents 34 Public-Key Infrastructure 31 AI & Security 5 Post-Quantum Cryptography 15 Electronic Voting 8 Networks, Distributed Systems & Security 9 Security Ceremonies 5 Biomedical Signal Analysis 8 Computational Intelligence 3 Scientific Computing & Instrumentation 6 Cryptography 59 Finite-Field Arithmetic 6 Privacy & Secure Information Sharing 7

Digital Trust

Digital Identity (20)

From Self-Sovereign Identity to Fiduciary Identity: A Journey Towards Greater User Privacy and Usability

Frederico Schardong, Ricardo Cust\'odio

Proceedings of the 39th ACM/SIGAPP Symposium on Applied Computing, SAC 2024, Avila, Spain, April 8-12, 2024, 2024

Digital Identity

Conference paper · preferred

Seamless Transition to Post-Quantum TLS 1.3: A Hybrid Approach Using Identity-Based Encryption

ASTRIZI , THIAGO LEUCZ, Ricardo Felipe Custodio

SENSORS, 2024

Post-Quantum Cryptography Digital Identity Cryptography

Journal article · preferred

The Role-Artifact-Function Framework for Understanding Digital Identity Models

Frederico Schardong, Ricardo Cust\'odio

Conceptual Modeling - 43rd International Conference, ER 2024, Pittsburgh, PA, USA, October 28-31, 2024, Proceedings, 2024

Digital Identity

Conference paper · preferred

Leveraging Self-Sovereign Identity, Blockchain, and Zero-Knowledge Proof to Build a Privacy-Preserving Vaccination Pass

Maur\'\icio de Vasconcelos Barros, Frederico Schardong, Ricardo Felipe Cust\'odio

CoRR, 2022

Digital Identity Cryptography Electronic Documents

arXiv / CoRR · preferred

Post-Quantum Electronic Identity: Adapting OpenID Connect and OAuth 2.0 to the Post-Quantum Era

Frederico Schardong, Alexandre Augusto Giron, Fernanda Larisa M\"uller, Ricardo Cust\'odio

Cryptology and Network Security - 21st International Conference, CANS 2022, Dubai, United Arab Emirates, November 13-16, 2022, Proceedings, 2022

Post-Quantum Cryptography Digital Identity Cryptography

Conference paper · preferred

Self-Sovereign Identity: A Systematic Review, Mapping and Taxonomy

Frederico Schardong, Ricardo Cust\'odio

Sensors, 2022

Digital Identity

Journal article · preferred

Touchless Authentication for Health Professionals: Analyzing the Risks and Proposing Alternatives to Dirty Interfaces

Chiarelli Ara\'ujo Vale, Frederico Schardong, Maur\'\icio de Vasconcelos Barros, Ricardo Cust\'odio

35th IEEE International Symposium on Computer-Based Medical Systems, CBMS 2022, Shenzen, China, July 21-23, 2022, 2022

Electronic Documents Digital Identity

Conference paper · preferred

Matching Metadata on Blockchain for Self-Sovereign Identity

Frederico Schardong, Ricardo Felipe Cust\'odio, La\'ercio Pioli, Jo\~ao Vicente Meyer

Business Process Management Workshops - BPM 2021 International Workshops, Rome, Italy, September 6-10, 2021, Revised Selected Papers, 2021

Digital Identity

Conference paper · preferred

Self-Sovereign Identity: A Systematic Map and Review

Frederico Schardong, Ricardo Felipe Cust\'odio

CoRR, 2021

Digital Identity

arXiv / CoRR · preferred

Certi¿cado Digital Acadêmico na Nuvem

MARTINA, JEAN, PEREIRA, FERNANDO, PIERI, GIOVANI, BEZERRA, ROQUE, CORDEIRO, LUIS, MEURER, LEONARDO, GERÔNIMO, GUILHERME, Ricardo Felipe Custodio, Douglas Martins, MACELAI, VINICIUS

Anais do IX Workshop de Gestão de Identidades Digitais (WGID 2019), 2019

Digital Identity

Conference paper · preferred

Privacy-aware web authentication protocol with recovery and revocation

Lucas Boppre Niehues, Ricardo Felipe Custodio

XVII Simpo&\#769;sio Brasileiro de Seguranc&\#807;a da Informac&\#807;a&\#771;o e de Sistemas Computacionais - SBSEG 2017, 2017

Digital Identity

Conference paper · preferred

A Privacy-Enhanced User-Centric Identity and Access Management Based on Notary

Henri Nogueira, Rick Lopes de Souza, Ricardo Felipe Custodio

The Eighth International Conference on Systems and Networks Communications, 2013

Electronic Documents Public-Key Infrastructure Digital Identity

Conference paper · preferred

An Attribute-Based Public Key Infrastructure

Hendri Nogueira, Ricardo Felipe Custodio, Jean Everson Martina

International Journal of Computer Science and Information Security, 2013

Public-Key Infrastructure Digital Identity Electronic Voting Cryptography

Journal article · preferred

Digital authentication of medical records: have we found a solution?

Aldo von Wangenheim, Ricardo Felipe Custodio, MARTINA, JEAN EVERSON, GIULIANO, ISABELA DE BACK, Rafael Andrade

Revista da Associação Médica Brasileira, 2013

Electronic Documents Digital Identity

Journal article · preferred

Multi-Factor Authentication in Telemedicine Systems

Dayana P. B. Spagnuelo, Jean Everson Martina, Ricardo Felipe Custodio, Rafael Andrade

eTELEMED 2013 : The Fifth International Conference on eHealth, Telemedicine, and Social Medicine, 2013

Digital Identity

Conference paper · preferred

Multi-factor Authentication in Key Management Systems

Rick Lopes de Souza, Lau Cheuk Lung, Ricardo Felipe Cust\'odio

12th IEEE International Conference on Trust, Security and Privacy in Computing and Communications, TrustCom 2013 / 11th IEEE International Symposium on Parallel and Distributed Processing with Applications, ISPA-13 / 12th IEEE International Conference on Ubiquitous Computing and Communications, IUCC-2013, Melbourne, Australia, July 16-18, 2013, 2013

Public-Key Infrastructure Digital Identity

Conference paper · preferred

Towards a Formal Verification of a Multi-factor Authentication Protocol Using Automated Theorem Provers

Eduardo dos Santos, Jean Everson Martina, Ricardo Felipe Cust\'odio

11th IEEE International Conference on Trust, Security and Privacy in Computing and Communications, TrustCom 2012, Liverpool, United Kingdom, June 25-27, 2012, 2012

Digital Identity Cryptography

Conference paper · preferred

Autenticação digital de documentos médicos: encontramos a solução?

Nobre, Luiz Felipe, von Wangenheim, Aldo, Ricardo Felipe Custodio

RB. Radiologia Brasileira (Impresso), 2011

Electronic Documents Digital Identity

Journal article · preferred

Carimbos do Tempo Autenticados para a Preservação por Longo Prazo de Assinaturas Digitais

Nelson da Silva, Thiago Acórdi Ramos, Ricardo Felipe Custodio

XI SBSEG, 2011

Electronic Documents Digital Signatures Digital Identity Cryptography

Conference paper · preferred

Audit and backup procedures for hardware security modules

T\'ulio Cicero Salvaro de Souza, Jean Everson Martina, Ricardo Felipe Cust\'odio

IDtrust 2008, Proceedings of the 7th Symposium on Identity and Trust on the Internet, March 4-6, 2008, Gaithersburg, Maryland, USA, 2008

Digital Identity

Conference paper · preferred

Digital Signatures (20)

Anamorphic Construction For The Winternitz OTS Scheme Family

Lucas Mayr, Jo\~ao Gabriel Feres, Bruno Bianchi Pagani, Ricardo Cust\'odio

IACR Cryptol. ePrint Arch., 2026

Post-Quantum Cryptography Digital Signatures Cryptography

IACR ePrint · preferred

Redefining Digital Web Signature Secrecy: A Client-Side Model for Enhanced Security and Compliance

Wellington Fernandes Silvano, Lucas Mayr, Enzo Brum, Gabriel Cabral, Frederico Schardong, Ricardo Cust\'odio

J. Braz. Comput. Soc., 2026

Digital Signatures Cryptography

Journal article · preferred

Monitoring Key Pair Usage through Distributed Ledgers and One-Time Signatures

Lucas Mayr, Lucas M. Palma, Gustavo Zambonin, Wellington Silvano, Ricardo Cust\'odio

Inf., 2023

Digital Signatures Cryptography

Journal article · preferred

Simplifying Electronic Document Digital Signatures

Lucas Mayr, Frederico Schardong, Ricardo Felipe Cust\'odio

CoRR, 2022

Digital Signatures Electronic Documents Cryptography

arXiv / CoRR · preferred

Improved constant-sum encodings for hash-based signatures

Lucas Pandolfo Perin, Gustavo Zambonin, Ricardo Felipe Cust\'odio, Lucia Moura, Daniel Panario

J. Cryptogr. Eng., 2021

Digital Signatures Cryptography

Journal article · preferred

Post-quantum signature with preimage chameleon hashing

Thiago Astrizi, Ricardo Felipe Custodio, Lucia Moura

XX Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2020

Post-Quantum Cryptography Cryptography Digital Signatures

Conference paper · preferred

Tuning the Winternitz hash-based digital signature scheme

Lucas Pandolfo Perin, Gustavo Zambonin, Douglas Marcelino Beppler Martins, Ricardo Felipe Cust\'odio, Jean Everson Martina

2018 IEEE Symposium on Computers and Communications, ISCC 2018, Natal, Brazil, June 25-28, 2018, 2018

Post-Quantum Cryptography Digital Signatures Cryptography

Conference paper · preferred

Locating modifications in signed data for partial data integrity

Tha\'\is Bardini Idalino, Lucia Moura, Ricardo Felipe Cust\'odio, Daniel Panario

Inf. Process. Lett., 2015

Digital Signatures Electronic Documents Cryptography

Journal article · preferred arXiv / CoRR

A User-Centric Digital Signature Scheme

Felipe Carlos Werlang, Ricardo Felipe Cust\'odio, Mart\'\in Augusto Gagliotti Vigil

Public Key Infrastructures, Services and Applications - 10th European Workshop, EuroPKI 2013, Egham, UK, September 12-13, 2013, Revised Selected Papers, 2013

Digital Signatures Public-Key Infrastructure Cryptography

Conference paper · preferred

Cleaning up the PKI for Long-term Signatures

Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio

XII SBSeg 2012, 2012

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

The Notary Based PKI - A Lightweight PKI for Long-Term Signatures on Documents

Mart\'\in Augusto Gagliotti Vigil, Cristian Thiago Moecke, Ricardo Felipe Cust\'odio, Melanie Volkamer

Public Key Infrastructures, Services and Applications - 9th European Workshop, EuroPKI 2012, Pisa, Italy, September 13-14, 2012, Revised Selected Papers, 2012

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred Conference paper

Carimbos do Tempo Autenticados para a Preservação por Longo Prazo de Assinaturas Digitais

Nelson da Silva, Thiago Acórdi Ramos, Ricardo Felipe Custodio

XI SBSEG, 2011

Electronic Documents Digital Signatures Digital Identity Cryptography

Conference paper · preferred

Electronic Documents with Signature Constraints

Felipe Carlos Werlang, Ricardo Felipe Custodio, Roberto Samarone dos Santos Araújo

I WGID, 2011

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Infra-estrutura de Chaves Públicas Otimizada: Uma ICP de Suporte a Assinaturas Eficientes para Documentos Eletrônicos

Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio, Ricardo Alexandre Reinaldo de Moraes

IX Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2009

Electronic Documents Public-Key Infrastructure Digital Signatures Cryptography

Conference paper · preferred

Optimized Certificates - A New Proposal for Efficient Electronic Document Signature Validation

Ricardo Felipe Cust\'odio, Mart\'\in Augusto Gagliotti Vigil, Juliano Romani, Fernando Carlos Pereira, Joni da Silva Fraga

Public Key Infrastructure, 5th European PKI Workshop: Theory and Practice, EuroPKI 2008, Trondheim, Norway, June 16-17, 2008, Proceedings, 2008

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Certificados Otimizados para a validação eficiente da Assinatura Digital

Adriana Elissa Notoya, Ricardo Felipe Custodio, Fernando Carlos Pereira, Joni da Silva Fraga

VII Certificados Otimizados para a validação eficiente da Assinatura Digital, 2007

Public-Key Infrastructure Digital Signatures Cryptography

Conference paper · preferred

Execução Segura de Assinaturas Confiáveis em Documentos Eletrônicos

Júlio da Silva Dias, Jean Everson Martina, Ricardo Felipe Custodio, Daniel Santana de Freitas

SBRC 2004, 2004

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Assinatura Confiável de Documentos Eletrônicos

Júlio da Silva Dias, Ricardo Felipe Custodio, Carlos Roberto de Rolt

WSeg-2003, 2003

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Sistema Seguro para Assinatura de Documentos Eletrônicos

Júlio da Silva Dias, Ricardo Felipe Custodio, Carlos Roberto de Rolt

Anais do IADIS WWW/internet 2003, 2003

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Assinatura Digital de Documentos Eletrônicos através da Impressão Digital

Juliano Fontoura Kazienko, Felipe Pompeo Pereira, Ricardo Felipe Custodio

XII Seminário Regional de Informática, 2002

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Electronic Documents (34)

Inteligência Artificial no Registro Civil do Brasil

Gustavo Rentato Fiscarelli, Luis Carlos Vendramin Junior, Ricardo Felipe Custodio

Editora Método, 2025

Electronic Documents AI & Security

Book · preferred

Leveraging Self-Sovereign Identity, Blockchain, and Zero-Knowledge Proof to Build a Privacy-Preserving Vaccination Pass

Maur\'\icio de Vasconcelos Barros, Frederico Schardong, Ricardo Felipe Cust\'odio

CoRR, 2022

Digital Identity Cryptography Electronic Documents

arXiv / CoRR · preferred

Simplifying Electronic Document Digital Signatures

Lucas Mayr, Frederico Schardong, Ricardo Felipe Cust\'odio

CoRR, 2022

Digital Signatures Electronic Documents Cryptography

arXiv / CoRR · preferred

Touchless Authentication for Health Professionals: Analyzing the Risks and Proposing Alternatives to Dirty Interfaces

Chiarelli Ara\'ujo Vale, Frederico Schardong, Maur\'\icio de Vasconcelos Barros, Ricardo Cust\'odio

35th IEEE International Symposium on Computer-Based Medical Systems, CBMS 2022, Shenzen, China, July 21-23, 2022, 2022

Electronic Documents Digital Identity

Conference paper · preferred

Locating modifications in signed data for partial data integrity

Tha\'\is Bardini Idalino, Lucia Moura, Ricardo Felipe Cust\'odio, Daniel Panario

Inf. Process. Lett., 2015

Digital Signatures Electronic Documents Cryptography

Journal article · preferred arXiv / CoRR

A Privacy-Enhanced User-Centric Identity and Access Management Based on Notary

Henri Nogueira, Rick Lopes de Souza, Ricardo Felipe Custodio

The Eighth International Conference on Systems and Networks Communications, 2013

Electronic Documents Public-Key Infrastructure Digital Identity

Conference paper · preferred

Digital authentication of medical records: have we found a solution?

Aldo von Wangenheim, Ricardo Felipe Custodio, MARTINA, JEAN EVERSON, GIULIANO, ISABELA DE BACK, Rafael Andrade

Revista da Associação Médica Brasileira, 2013

Electronic Documents Digital Identity

Journal article · preferred

Cleaning up the PKI for Long-term Signatures

Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio

XII SBSeg 2012, 2012

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

The Notary Based PKI - A Lightweight PKI for Long-Term Signatures on Documents

Mart\'\in Augusto Gagliotti Vigil, Cristian Thiago Moecke, Ricardo Felipe Cust\'odio, Melanie Volkamer

Public Key Infrastructures, Services and Applications - 9th European Workshop, EuroPKI 2012, Pisa, Italy, September 13-14, 2012, Revised Selected Papers, 2012

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred Conference paper

Autenticação digital de documentos médicos: encontramos a solução?

Nobre, Luiz Felipe, von Wangenheim, Aldo, Ricardo Felipe Custodio

RB. Radiologia Brasileira (Impresso), 2011

Electronic Documents Digital Identity

Journal article · preferred

Carimbos do Tempo Autenticados para a Preservação por Longo Prazo de Assinaturas Digitais

Nelson da Silva, Thiago Acórdi Ramos, Ricardo Felipe Custodio

XI SBSEG, 2011

Electronic Documents Digital Signatures Digital Identity Cryptography

Conference paper · preferred

Electronic Documents with Signature Constraints

Felipe Carlos Werlang, Ricardo Felipe Custodio, Roberto Samarone dos Santos Araújo

I WGID, 2011

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Using Notary Based Public Key Infrastructure in Shibboleth

NOGUEIRA, H, Ricardo Felipe Custodio, Cristian Thiago Moecke, Michelle Silva Wangham

I WGID, 2011

Public-Key Infrastructure Electronic Documents

Conference paper · preferred

An Infrastructure for Long-Term Archiving of Authenticated and Sensitive Electronic Documents

Thiago Ac\'ordi Ramos, Nelson da Silva, Lau Cheuk Lung, Jonathan Gehard Kohler, Ricardo Felipe Cust\'odio

Public Key Infrastructures, Services and Applications - 7th European Workshop, EuroPKI 2010, Athens, Greece, September 23-24, 2010. Revised Selected Papers, 2010

Public-Key Infrastructure Electronic Documents

Conference paper · preferred

Infra-estrutura de Chaves Públicas Otimizada: Uma ICP de Suporte a Assinaturas Eficientes para Documentos Eletrônicos

Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio, Ricardo Alexandre Reinaldo de Moraes

IX Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2009

Electronic Documents Public-Key Infrastructure Digital Signatures Cryptography

Conference paper · preferred

Propostas para apoiar a preservação documental de longo prazo na ICP-Brasil

Rafael Timóteeo de Souza Jr., Ricardo Felipe Custodio, Viviane Bertol

CIBSI 2009 - V Congreso Iberoamericano de Seguridad Informática, 2009

Public-Key Infrastructure Electronic Documents

Conference paper · preferred

Optimized Certificates - A New Proposal for Efficient Electronic Document Signature Validation

Ricardo Felipe Cust\'odio, Mart\'\in Augusto Gagliotti Vigil, Juliano Romani, Fernando Carlos Pereira, Joni da Silva Fraga

Public Key Infrastructure, 5th European PKI Workshop: Theory and Practice, EuroPKI 2008, Trondheim, Norway, June 16-17, 2008, Proceedings, 2008

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Central Notarial de Serviços Eletrônicos Compartilhados

Nelson da Silva, Ricardo Felipe Custodio, Ricardo Pereira e Silva, Thiago Acórdi Ramos

Yendis, 2007

Electronic Documents Public-Key Infrastructure

Book · preferred

Execução Segura de Assinaturas Confiáveis em Documentos Eletrônicos

Júlio da Silva Dias, Jean Everson Martina, Ricardo Felipe Custodio, Daniel Santana de Freitas

SBRC 2004, 2004

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Módulo Cifrador de Documentos Eletrônicos

Ricardo Felipe Custodio, Júlio da Silva Dias, Fernando Carlos Pereira, Adriana Elissa Notoya

WSeg 2004 - IV Workshop em Segurança de Sistemas Computacionais, 2004

Electronic Documents

Conference paper · preferred

Uma infra-estrutura para o sigilo temporal de documentos eletrônicos

Ricardo Felipe Custodio, Júlio da Silva Dias, Fernando Carlos Pereira, Adriana Elissa Notoya

Scientia (UNISINOS), 2004

Electronic Documents

Journal article · preferred

Assinatura Confiável de Documentos Eletrônicos

Júlio da Silva Dias, Ricardo Felipe Custodio, Carlos Roberto de Rolt

WSeg-2003, 2003

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Confiança na Tempestividade dos Documentos Eletrônicos: Auditoria da Protocolação Digital

Vanessa Costa, Ricardo Felipe Custodio, Júlio da Silva Dias, Carlos Roberto de Rolt

Anais Eletrônicos do SSI'2003, 2003

Electronic Documents

Conference paper · preferred

Protocolação Digital de Documentos Eletrônicos

Vanessa Costa, Ricardo Felipe Custodio, Júlio da Silva Dias, Carlos Roberto de Rolt

I Fórum sobre Segurança, Privacidade e Certificação Digital, 2003

Electronic Documents Public-Key Infrastructure

Conference paper · preferred

Reliable Clock Synchronization for Eletronic Documents

J\'ulio S. Dias, Denise B. Dem\'etrio, Ricardo Felipe Cust\'odio, Carlos Roberto De Rolt

3rd Latin American Network Operations and Management Symposium, LANOMS 2003, Iguassu Falls, Brazil, September 4-6, 2003. Proceedings, 2003

Electronic Documents

Conference paper · preferred

Sincronização Segura de Relógio para Documentos Eletrônicos

Júlio da Silva Dias, Ricardo Felipe Custodio, Denise Bendo Demétrio

SBRC 2003, 2003

Electronic Documents

Conference paper · preferred

Sistema Seguro para Assinatura de Documentos Eletrônicos

Júlio da Silva Dias, Ricardo Felipe Custodio, Carlos Roberto de Rolt

Anais do IADIS WWW/internet 2003, 2003

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

A New Method for Digital Time-Stamping of Electronic Documents

Everton Schonardie Pasqual, Júlio da Silva Dias, Ricardo Felipe Custodio

14th Anual FIRST Conference on Computer Security Incident Handling & Response 2002, 2002

Electronic Documents

Conference paper · preferred

Assinatura Digital de Documentos Eletrônicos através da Impressão Digital

Juliano Fontoura Kazienko, Felipe Pompeo Pereira, Ricardo Felipe Custodio

XII Seminário Regional de Informática, 2002

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

IARSDE: Infra-estrutura de Armazenamento e Recuperação Segura de Documentos Eletrônicos

Adriana Elissa Notoya, Ricardo Felipe Custodio

The International Symposium on Document Technologies, 2002

Electronic Documents

Conference paper · preferred

Uma Proposta Para Garantia da Validade do Documento Eletronico por Tempo Indeterminado

Adriana Elissa Notoya, Ricardo Felipe Custodio

SSI´2002 - IV Simposio Seguranca em Informatica, 2002

Electronic Documents

Conference paper · preferred

Aspectos Tecnológicos para a Validade Jurídica da Cópia Impressa&\#10;de um Documento Eletrônico

Adriana Elissa Notoya, Ricardo Felipe Custodio

SEMINC 2001, 2001

Electronic Documents

Conference paper · preferred

Cartório Virtual: uma experiência na emissão de certidão de nascimento.

Aires José Rover, Ricardo Felipe Custodio, Dejane Luiza Bortoli

Revista do Curso de Direito das Faculdades Jorge Amado, 2001

Electronic Documents

Journal article · preferred

Um Novo Método para Datação de Documentos Eletrônicos

Everton Schonardie Pasqual, Júlio da Silva Dias, Ricardo Felipe Custodio

SEMINC 2001, 2001

Electronic Documents

Conference paper · preferred

Public-Key Infrastructure (31)

Automated Issuance of Post-Quantum Certificates: A New Challenge

Alexandre Augusto Giron, Frederico Schardong, Lucas Pandolfo Perin, Ricardo Cust\'odio, Victor Valle, V\'\ictor Mateu

Applied Cryptography and Network Security - 22nd International Conference, ACNS 2024, Abu Dhabi, United Arab Emirates, March 5-8, 2024, Proceedings, Part II, 2024

Post-Quantum Cryptography Public-Key Infrastructure Cryptography

Conference paper · preferred IACR ePrint

A Privacy-Enhanced User-Centric Identity and Access Management Based on Notary

Henri Nogueira, Rick Lopes de Souza, Ricardo Felipe Custodio

The Eighth International Conference on Systems and Networks Communications, 2013

Electronic Documents Public-Key Infrastructure Digital Identity

Conference paper · preferred

A User-Centric Digital Signature Scheme

Felipe Carlos Werlang, Ricardo Felipe Cust\'odio, Mart\'\in Augusto Gagliotti Vigil

Public Key Infrastructures, Services and Applications - 10th European Workshop, EuroPKI 2013, Egham, UK, September 12-13, 2013, Revised Selected Papers, 2013

Digital Signatures Public-Key Infrastructure Cryptography

Conference paper · preferred

An Attribute-Based Public Key Infrastructure

Hendri Nogueira, Ricardo Felipe Custodio, Jean Everson Martina

International Journal of Computer Science and Information Security, 2013

Public-Key Infrastructure Digital Identity Electronic Voting Cryptography

Journal article · preferred

Implementation of Trust Metrics in X.509 Public Key Infrastructure

Lucas Gonçalves Martins, Ricardo Felipe Custodio

The Seventh International Conference on Emerging Security Information, Systems and Technologies, 2013

Public-Key Infrastructure

Conference paper · preferred

Multi-factor Authentication in Key Management Systems

Rick Lopes de Souza, Lau Cheuk Lung, Ricardo Felipe Cust\'odio

12th IEEE International Conference on Trust, Security and Privacy in Computing and Communications, TrustCom 2013 / 11th IEEE International Symposium on Parallel and Distributed Processing with Applications, ISPA-13 / 12th IEEE International Conference on Ubiquitous Computing and Communications, IUCC-2013, Melbourne, Australia, July 16-18, 2013, 2013

Public-Key Infrastructure Digital Identity

Conference paper · preferred

Sistema Gerenciador de Certificados Digitais: Um modelo para governo eletrônico

Lucas Gonçalves Martins, Ricardo Felipe Custodio

IX Simpósio Brasileiro de Sistemas de Informação, 2013

Public-Key Infrastructure

Conference paper · preferred

Cleaning up the PKI for Long-term Signatures

Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio

XII SBSeg 2012, 2012

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

The Notary Based PKI - A Lightweight PKI for Long-Term Signatures on Documents

Mart\'\in Augusto Gagliotti Vigil, Cristian Thiago Moecke, Ricardo Felipe Cust\'odio, Melanie Volkamer

Public Key Infrastructures, Services and Applications - 9th European Workshop, EuroPKI 2012, Pisa, Italy, September 13-14, 2012, Revised Selected Papers, 2012

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred Conference paper

Análise e implementação de um protocolo de gerenciamento de certificados

Anderson Luiz Silverio, KOHLER, J. G, Ricardo Felipe Custodio

WTICG 2011, 2011

Public-Key Infrastructure

Conference paper · preferred

Using Notary Based Public Key Infrastructure in Shibboleth

NOGUEIRA, H, Ricardo Felipe Custodio, Cristian Thiago Moecke, Michelle Silva Wangham

I WGID, 2011

Public-Key Infrastructure Electronic Documents

Conference paper · preferred

An Infrastructure for Long-Term Archiving of Authenticated and Sensitive Electronic Documents

Thiago Ac\'ordi Ramos, Nelson da Silva, Lau Cheuk Lung, Jonathan Gehard Kohler, Ricardo Felipe Cust\'odio

Public Key Infrastructures, Services and Applications - 7th European Workshop, EuroPKI 2010, Athens, Greece, September 23-24, 2010. Revised Selected Papers, 2010

Public-Key Infrastructure Electronic Documents

Conference paper · preferred

Uma ICP baseada em certificados digitais autoassinados

Cristian Thiago Moecke, Ricardo Felipe Custodio, KOHLER, J. G, Marcelo Carlomagno Carlos

X Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2010

Public-Key Infrastructure

Conference paper · preferred

Ceremonies Design for PKI's Hardware Security Modules

Jean Everson Martina, Túlio Salvaro, Ricardo Felipe Custodio

SBSeg 2009, 2009

Public-Key Infrastructure Security Ceremonies

Conference paper · preferred

Ceremonies Formal Analysis in PKI's Context

Jean Everson Martina, T\'ulio Cicero Salvaro de Souza, Ricardo Felipe Cust\'odio

Proceedings of the 12th IEEE International Conference on Computational Science and Engineering, CSE 2009, Vancouver, BC, Canada, August 29-31, 2009, 2009

Public-Key Infrastructure Security Ceremonies

Conference paper · preferred

Infra-estrutura de Chaves Públicas Otimizada: Uma ICP de Suporte a Assinaturas Eficientes para Documentos Eletrônicos

Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio, Ricardo Alexandre Reinaldo de Moraes

IX Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2009

Electronic Documents Public-Key Infrastructure Digital Signatures Cryptography

Conference paper · preferred

Propostas para apoiar a preservação documental de longo prazo na ICP-Brasil

Rafael Timóteeo de Souza Jr., Ricardo Felipe Custodio, Viviane Bertol

CIBSI 2009 - V Congreso Iberoamericano de Seguridad Informática, 2009

Public-Key Infrastructure Electronic Documents

Conference paper · preferred

Good practices for Long-Term Key Management in a Public Key Infrastructure

Marcelo Carlomagno Carlos, Ricardo Felipe Custodio, Jeandré Monteiro Sutil

CSEWORKSHOPS '08: Proceedings of the 2008 11th IEEE International Conference on Computational Science and Engineering - Workshops, 2008

Public-Key Infrastructure

Conference paper · preferred

Optimized Certificates - A New Proposal for Efficient Electronic Document Signature Validation

Ricardo Felipe Cust\'odio, Mart\'\in Augusto Gagliotti Vigil, Juliano Romani, Fernando Carlos Pereira, Joni da Silva Fraga

Public Key Infrastructure, 5th European PKI Workshop: Theory and Practice, EuroPKI 2008, Trondheim, Norway, June 16-17, 2008, Proceedings, 2008

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Self-Adaptable and Intrusion Tolerant Certificate Authority for Mobile Ad Hoc Networks

Fernando Carlos Pereira, Joni da Silva Fraga, Ricardo Felipe Cust\'odio

22nd International Conference on Advanced Information Networking and Applications, AINA 2008, GinoWan, Okinawa, Japan, March 25-28, 2008, 2008

Public-Key Infrastructure

Conference paper · preferred

Autoridade Certificadora Dinâmica para Redes Ad Hoc Móveis

Fernando Carlos Pereira, Joni da Silva Fraga, Adriana Elissa Notoya, Ricardo Felipe Custodio

25o. Simpósio Brasileiro de Redes de Computadores e Sistemas Distribuídos (SBRC), 2007

Public-Key Infrastructure

Conference paper · preferred

Central Notarial de Serviços Eletrônicos Compartilhados

Nelson da Silva, Ricardo Felipe Custodio, Ricardo Pereira e Silva, Thiago Acórdi Ramos

Yendis, 2007

Electronic Documents Public-Key Infrastructure

Book · preferred

Certificados Otimizados para a validação eficiente da Assinatura Digital

Adriana Elissa Notoya, Ricardo Felipe Custodio, Fernando Carlos Pereira, Joni da Silva Fraga

VII Certificados Otimizados para a validação eficiente da Assinatura Digital, 2007

Public-Key Infrastructure Digital Signatures Cryptography

Conference paper · preferred

OpenHSM: An Open Key Life Cycle Protocol for Public Key Infrastructure's Hardware Security Modules

Jean Everson Martina, T\'ulio Cicero Salvaro de Souza, Ricardo Felipe Cust\'odio

Public Key Infrastructure, 4th European PKI Workshop: Theory and Practice, EuroPKI 2007, Palma de Mallorca, Spain, June 28-30, 2007, Proceedings, 2007

Public-Key Infrastructure Cryptography

Conference paper · preferred

Temporal Key Release Infrastructure

Ricardo Felipe Custodio, Júlio da Silva Dias, Fernando Carlos Pereira, Adriana Elissa Notoya

6th Annual PKI R&D Workshop, 2007

Public-Key Infrastructure

Conference paper · preferred

Tornando uma infra-estrutura de chaves publicas dinâmica

Marcelo Carlomagno Carlos, Ricardo Felipe Custodio

SSI 2006, 2006

Public-Key Infrastructure

Conference paper · preferred

Infra-estrutura de Chaves Públicas e Aplicações

Ricardo Felipe Custodio, Adriana Elissa Notoya, Fernando Carlos Pereira

XII Escola Regional de Informática da SBC, 2004

Public-Key Infrastructure

Book chapter · preferred

Protocolação Digital de Documentos Eletrônicos

Vanessa Costa, Ricardo Felipe Custodio, Júlio da Silva Dias, Carlos Roberto de Rolt

I Fórum sobre Segurança, Privacidade e Certificação Digital, 2003

Electronic Documents Public-Key Infrastructure

Conference paper · preferred

Tecnologias para a Segurança da Informação: Infra-estrutura de Chaves Públicas

Ricardo Felipe Custodio

EIN/Ecoinfo 2002, 2002

Public-Key Infrastructure

Conference paper · preferred

Infra-estrutura de chaves públicas

Ricardo Felipe Custodio

3o. Simpósio de Segurança em Informação, 2001

Public-Key Infrastructure

Conference paper · preferred

Proteção de Software por Certificação Digital

João Luiz Francalacci Rocha, Ricardo Felipe Custodio

SSI 2001, 2001

Public-Key Infrastructure

Conference paper · preferred

Emerging Directions

AI & Security (5)

Automation and Risk: Transformers Models Reshape Sensitive Information Management

Wellington Fernandes Silvano, Maur\'\icio Konrath, Lucas Mayr, Ricardo Felipe Cust\'odio

Information Systems Security - 21st International Conference, ICISS 2025, Indore, India, December 16-20, 2025, Proceedings, 2025

AI & Security

Conference paper · preferred

Inteligência Artificial no Registro Civil do Brasil

Gustavo Rentato Fiscarelli, Luis Carlos Vendramin Junior, Ricardo Felipe Custodio

Editora Método, 2025

Electronic Documents AI & Security

Book · preferred

Limits and Surprises of Cross-Lingual BERT Under Data Scarcity: A Portuguese Case Study in Sensitive-Text Classification

Wellington Fernandes Silvano, Maur\'\icio Konrath, Ricardo Felipe Cust\'odio

Advances in Soft Computing - 24th Mexican International Conference on Artificial Intelligence, MICAI 2025, Guanajuato, Mexico, November 3, 2025, Proceedings, Part II, 2025

AI & Security

Conference paper · preferred

Rethinking GAN-BERT for Sensitive Text Classification: The Impact of Training Dynamics and Domain Alignment in Low-Data Scenarios

Wellington Fernandes Silvano, Maur\'\icio Konrath, Ricardo Felipe Cust\'odio

Advances in Soft Computing - 24th Mexican International Conference on Artificial Intelligence, MICAI 2025, Guanajuato, Mexico, November 3, 2025, Proceedings, Part II, 2025

AI & Security

Conference paper · preferred

A proposal for Efficient Neural Network Data Structuring

Ricardo Felipe Custodio, Francisco Olegário Muller Neto, Walter Celso de Lima

Ninth International Conference on Systems Engineering, 1993

AI & Security

Conference paper · preferred

Post-Quantum Cryptography (15)

Anamorphic Construction For The Winternitz OTS Scheme Family

Lucas Mayr, Jo\~ao Gabriel Feres, Bruno Bianchi Pagani, Ricardo Cust\'odio

IACR Cryptol. ePrint Arch., 2026

Post-Quantum Cryptography Digital Signatures Cryptography

IACR ePrint · preferred

From ElGamal to Lattice-Based: Enhancing Helios Voting with Quantum-Safe Cryptography

Jo\~ao Pedro Cardoso Barbosa, Gustavo Zambonin, Tha\'\is Bardini Idalino, Ricardo Felipe Cust\'odio

Applied Cryptography and Network Security - 23rd International Conference, ACNS 2025, Munich, Germany, June 23-26, 2025, Proceedings, Part III, 2025

Post-Quantum Cryptography Electronic Voting Cryptography

Conference paper · preferred

A Concrete LIP-Based KEM With Simple Lattices

Gustavo de Castro Biage, Gustavo Zambonin, Tha\'\is Bardini Idalino, Daniel Panario, Ricardo Felipe Cust\'odio

IEEE Access, 2024

Post-Quantum Cryptography Cryptography

Journal article · preferred

Automated Issuance of Post-Quantum Certificates: A New Challenge

Alexandre Augusto Giron, Frederico Schardong, Lucas Pandolfo Perin, Ricardo Cust\'odio, Victor Valle, V\'\ictor Mateu

Applied Cryptography and Network Security - 22nd International Conference, ACNS 2024, Abu Dhabi, United Arab Emirates, March 5-8, 2024, Proceedings, Part II, 2024

Post-Quantum Cryptography Public-Key Infrastructure Cryptography

Conference paper · preferred IACR ePrint

Probabilistic root finding in code-based cryptography

D\'unia Marchiori, Ricardo Cust\'odio, Daniel Panario, Lucia Moura

J. Cryptogr. Eng., 2024

Post-Quantum Cryptography Finite-Field Arithmetic Cryptography

Journal article · preferred

Seamless Transition to Post-Quantum TLS 1.3: A Hybrid Approach Using Identity-Based Encryption

ASTRIZI , THIAGO LEUCZ, Ricardo Felipe Custodio

SENSORS, 2024

Post-Quantum Cryptography Digital Identity Cryptography

Journal article · preferred

Post-quantum Hybrid KEMTLS Performance in Simulated and Real Network Environments

Alexandre Augusto Giron, Jo\~ao Pedro Adami do Nascimento, Ricardo Cust\'odio, Lucas Pandolfo Perin, V\'\ictor Mateu

Progress in Cryptology - LATINCRYPT 2023 - 8th International Conference on Cryptology and Information Security in Latin America, LATINCRYPT 2023, Quito, Ecuador, October 3-6, 2023, Proceedings, 2023

Post-Quantum Cryptography Cryptography

Conference paper · preferred IACR ePrint

Post-quantum hybrid key exchange: a systematic mapping study

Alexandre Augusto Giron, Ricardo Cust\'odio, Francisco Rodr\'\iguez-Henr\'\iquez

J. Cryptogr. Eng., 2023

Post-Quantum Cryptography Cryptography

Journal article · preferred

Quantum Threats to the TLS 1.3 Protocol

Luiz Filipi Anderson de Sousa Moura, GIRON, ALEXANDRE A., Ricardo Felipe Custodio

SECURWARE 2023 - The Seventeenth International Conference on Emerging Security Information, Systems and Technologies, 2023

Cryptography Post-Quantum Cryptography

Conference paper · preferred

Post-Quantum Electronic Identity: Adapting OpenID Connect and OAuth 2.0 to the Post-Quantum Era

Frederico Schardong, Alexandre Augusto Giron, Fernanda Larisa M\"uller, Ricardo Cust\'odio

Cryptology and Network Security - 21st International Conference, CANS 2022, Dubai, United Arab Emirates, November 13-16, 2022, Proceedings, 2022

Post-Quantum Cryptography Digital Identity Cryptography

Conference paper · preferred

Timing Analysis of Algorithm Substitution Attacks in a Post-Quantum TLS Protocol

MARCHIORI, DÚNIA, GIRON, ALEXANDRE A., NASCIMENTO, JOÃO PEDRO A. DO, Ricardo Felipe Custodio

Anais do XXI Simpósio Brasileiro de Segurança da Informação e de Sistemas Computacionais (SBSeg 2021), 2021

Post-Quantum Cryptography Cryptography

Conference paper · preferred

Towards constant-time probabilistic root finding for code-based cryptography

MARCHIORI, DÚNIA, Ricardo Felipe Custodio, PANARIO, DANIEL, MOURA, LUCIA

Anais do XXI Simpósio Brasileiro de Segurança da Informação e de Sistemas Computacionais (SBSeg 2021), 2021

Post-Quantum Cryptography Finite-Field Arithmetic Cryptography

Conference paper · preferred

Post-quantum signature with preimage chameleon hashing

Thiago Astrizi, Ricardo Felipe Custodio, Lucia Moura

XX Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2020

Post-Quantum Cryptography Cryptography Digital Signatures

Conference paper · preferred

Handling Vinegar Variables to Shorten Rainbow Key Pairs

Gustavo Zambonin, Matheus S. P. Bittencourt, Ricardo Felipe Cust\'odio

Progress in Cryptology - AFRICACRYPT 2019 - 11th International Conference on Cryptology in Africa, Rabat, Morocco, July 9-11, 2019, Proceedings, 2019

Post-Quantum Cryptography Cryptography

Conference paper · preferred

Tuning the Winternitz hash-based digital signature scheme

Lucas Pandolfo Perin, Gustavo Zambonin, Douglas Marcelino Beppler Martins, Ricardo Felipe Cust\'odio, Jean Everson Martina

2018 IEEE Symposium on Computers and Communications, ISCC 2018, Natal, Brazil, June 25-28, 2018, 2018

Post-Quantum Cryptography Digital Signatures Cryptography

Conference paper · preferred

Historical & Cross-Cutting

Electronic Voting (8)

From ElGamal to Lattice-Based: Enhancing Helios Voting with Quantum-Safe Cryptography

Jo\~ao Pedro Cardoso Barbosa, Gustavo Zambonin, Tha\'\is Bardini Idalino, Ricardo Felipe Cust\'odio

Applied Cryptography and Network Security - 23rd International Conference, ACNS 2025, Munich, Germany, June 23-26, 2025, Proceedings, Part III, 2025

Post-Quantum Cryptography Electronic Voting Cryptography

Conference paper · preferred

The Open Paradigm: A Systematic Analysis of Evolutionary Frameworks and Cross-Sectoral Applications in Data-Driven Ecosystems

COELHO, LUCIANO FIGUEIREDO, Ricardo Felipe Custodio, MATOS, MANUEL

IOSR Journal of Business and Management, 2025

Electronic Voting Cryptography

Journal article · preferred

Proposal of an Electronic Auditing System Applied to the Brazilian Electronic Voting Machine

Marcelo Ferreira Guimar\~aes, Carlos Ant\^onio Sell, Renato Parenti Turcato, Carlos Henrique Assuiti, Ricardo Cust\'odio, Ricardo Ant\^onio Pralon Santos

CoRR, 2024

Electronic Voting Cryptography

arXiv / CoRR · preferred

An Attribute-Based Public Key Infrastructure

Hendri Nogueira, Ricardo Felipe Custodio, Jean Everson Martina

International Journal of Computer Science and Information Security, 2013

Public-Key Infrastructure Digital Identity Electronic Voting Cryptography

Journal article · preferred

A Verifiable Voting Protocol Based on Farnel

Roberto Ara\'ujo, Ricardo Felipe Cust\'odio, Jeroen van de Graaf

Towards Trustworthy Elections, New Directions in Electronic Voting, 2010

Electronic Voting Cryptography

Conference paper · preferred IACR ePrint

An Electronic Scheme for the Farnel Paper-Based Voting Protocol

Roberto Samarone dos Santos Araújo, Ricardo Felipe Custodio, A. Wiesmaier, T. Takagi

4th International Conference on Applied Cryptography and Network Security (ACNS'06), 2006

Electronic Voting Cryptography

Conference paper · preferred

Ostracon: Um Sistema de Votação Digital pela Internet

Fabiano Castro Pereira, Ricardo Felipe Custodio

SBRC-2003, WSeg-2003, 2003

Electronic Voting Cryptography

Conference paper · preferred

Farnel: Um protocolo Criptográficos para Votação Digital

Ricardo Felipe Custodio, Roberto Samarone dos Santos Araújo, Augusto Jun Devegili

WSeg 2002, 2002

Electronic Voting Cryptography

Conference paper · preferred

Networks, Distributed Systems & Security (9)

TLS 1.3 Handshake Analyzer

Giron, Alexandre Augusto, SCHARDONG, FREDERICO, Ricardo Felipe Custodio

Anais Estendidos do XXII Simpósio Brasileiro de Segurança da Informação e de Sistemas Computacionais (SBSeg Estendido 2022), 2022

Networks, Distributed Systems & Security Cryptography

Conference paper · preferred

\(\mu\)Mobile IPv6 in wireless sensor networks

Ricardo Cust\'odio, Ricardo M. Silva, Jorge S\'a Silva, David Nunes, Fernando Boavida, Carlos Herrera

Seventh International Conference on Sensing Technology, ICST 2013, Wellington, New Zealand, December 3-5, 2013, 2013

Networks, Distributed Systems & Security

Conference paper · preferred

A coordination layer to handle real-time communication in Wi-Fi networks with uncontrolled traffic sources

Robson Costa, Paulo Portugal, Francisco Vasques, Ricardo de Moraes, Ricardo Felipe Cust\'odio

IEEE 36th Conference on Local Computer Networks, LCN 2011, Bonn, Germany, October 4-7, 2011, 2011

Networks, Distributed Systems & Security

Conference paper · preferred

Analytical Model to Evaluate the Performance of Mobile Agents in a Generic Network Topology

Juliana Amaral Arantes, Carlos Becker Westphall, Ricardo Felipe Cust\'odio, Shirlei Aparecida de Chaves

J. Netw. Syst. Manag., 2010

Networks, Distributed Systems & Security

Journal article · preferred

Assessment of the IEEE 802.11e EDCA Protocol Limitations when Dealing with Real-Time Communication

Ricardo de Moraes, Paulo Portugal, Francisco Vasques, Ricardo Felipe Cust\'odio

EURASIP J. Wirel. Commun. Netw., 2010

Networks, Distributed Systems & Security

Journal article · preferred

Distributed DBP: A (m, k)-firm based Distributed Approach for QoS Provision in IEEE 802.15.4 Networks

Tiago Semprebom, Carlos Montez, Ricardo de Moraes, Francisco Vasques, Ricardo Felipe Cust\'odio

Proceedings of 12th IEEE International Conference on Emerging Technologies and Factory Automation, ETFA 2009, September 22-25, 2008, Palma de Mallorca, Spain, 2009

Networks, Distributed Systems & Security

Conference paper · preferred

Client/Server and Mobile Agent Paradigms - An Analytical Model for Performance Evaluation

Juliana Amaral Arantes, Carlos Becker Westphall, Ricardo Felipe Custodio

Colloque Francophone sur la Gestion de Réseuax et Service, 2003, Fortaleza (CE), 2003

Networks, Distributed Systems & Security

Conference paper · preferred

Modelo Analítico para Avaliar Plataformas Cliente/Servidor e Agentes Móveis Aplicados à Gerência de Redes

Juliana Amaral Arantes, Carlos Becker Westphall, Ricardo Felipe Custodio

SBRC 2002, 2002

Networks, Distributed Systems & Security

Conference paper · preferred

Avaliação Analítica de Desempenho do Uso do Ipv6

Maurílio Alves Martins da Costa, Ricardo Felipe Custodio, Carlos Becker Westphall

I Workshop da Pós-Graduação em Ciência da Computação, 2000

Networks, Distributed Systems & Security

Conference paper · preferred

Security Ceremonies (5)

An adaptive threat model for security ceremonies

Jean Everson Martina, Eduardo dos Santos, Marcelo Carlomagno Carlos, Geraint Price, Ricardo Felipe Cust\'odio

Int. J. Inf. Sec., 2015

Security Ceremonies

Journal article · preferred

An updated threat model for security ceremonies

Marcelo Carlomagno Carlos, Jean Everson Martina, Geraint Price, Ricardo Felipe Cust\'odio

Proceedings of the 28th Annual ACM Symposium on Applied Computing, SAC '13, Coimbra, Portugal, March 18-22, 2013, 2013

Security Ceremonies

Conference paper · preferred

A Proposed Framework for Analysing Security Ceremonies

Marcelo Carlomagno Carlos, Jean Everson Martina, Geraint Price, Ricardo Felipe Cust\'odio

SECRYPT 2012 - Proceedings of the International Conference on Security and Cryptography, Rome, Italy, 24-27 July, 2012, SECRYPT is part of ICETE - The International Joint Conference on e-Business and Telecommunications, 2012

Security Ceremonies Cryptography

Conference paper · preferred

Ceremonies Design for PKI's Hardware Security Modules

Jean Everson Martina, Túlio Salvaro, Ricardo Felipe Custodio

SBSeg 2009, 2009

Public-Key Infrastructure Security Ceremonies

Conference paper · preferred

Ceremonies Formal Analysis in PKI's Context

Jean Everson Martina, T\'ulio Cicero Salvaro de Souza, Ricardo Felipe Cust\'odio

Proceedings of the 12th IEEE International Conference on Computational Science and Engineering, CSE 2009, Vancouver, BC, Canada, August 29-31, 2009, 2009

Public-Key Infrastructure Security Ceremonies

Conference paper · preferred

Historical Research

Biomedical Signal Analysis (8)

Use of Lyapunov Exponents for Pattern Recognition in Lung Sounds

Luiz Paulo Luna de Oliveira, Ricardo Felipe Custodio, Waldir Leite Roque

Proceedings of VIII Workshop on Nonlinear Dynamics of Eletronic Systems, 2000

Biomedical Signal Analysis

Conference paper · preferred

An\'alise n\~ao-linear no reconhecimento de padr\~oes sonoros : estudo de caso para sons pulmonares

Ricardo Felipe Cust\'odio

1999

Biomedical Signal Analysis

PhD thesis · preferred

Análise de Sons Pulmonares via Dinâmica Caótica

Waldir Leite Roque, Luiz Paulo Luna de Oliveira, Ricardo Felipe Custodio

I Jornada de Pneumologia do Mercosul, 1999

Biomedical Signal Analysis

Conference paper · preferred

Identifying Lung Sound Patterns through Lyapunov Exponent Estimations

Waldir Leite Roque, Luiz Paulo Luna de Oliveira, Ricardo Felipe Custodio

Congresso Nacional de Matematica Aplicada e Computacional, 1999

Biomedical Signal Analysis

Conference paper · preferred

Lung Sound Analysis with Time-Dependent Fractal Dimensions

Luiz Paulo Luna de Oliveira, Waldir Leite Roque, Ricardo Felipe Custodio

Chaos, Solitons and Fractals, 1999

Biomedical Signal Analysis

Journal article · preferred

Negative Lyapunov Exponent Estimations in Non Chaotic Data Time Series

Luiz Paulo Luna de Oliveira, Ricardo Felipe Custodio, Waldir Leite Roque

NDES99 - Nonlinear Dynamics of Electronic Systems, 1999

Biomedical Signal Analysis

Conference paper · preferred

PulSA: A System to Support Lung Sound Analysis

Waldir Leite Roque, T. Heimfarth, T. Spengler, H. Valliatti, Ricardo Felipe Custodio, Luiz Paulo Luna de Oliveira

The 23rf International Conference on Lung Sounds, 1999

Biomedical Signal Analysis

Conference paper · preferred

Time-Dependent Fractal Dimension of Lung Sounds

Waldir Leite Roque, Luiz Paulo Luna de Oliveira, Ricardo Felipe Custodio, H. Valliatti

International Conference on Lung Sounds, 1998

Biomedical Signal Analysis

Conference paper · preferred

Computational Intelligence (3)

Atomic Decomposition with Genetic Algorithms

Ricardo Felipe Custodio, Dante Augusto Couto Barone

1997 International Symposium on Nonlinear Theory and its Applications, 1997

Computational Intelligence

Conference paper · preferred

Estructuración Eficiente de los Datos de las Redes de Neuronas Artificiales

Ricardo Felipe Custodio, J. P. Oliveira, O. R. Garcia, Walter Celso de Lima

X Congresso Chileno de Engenharia Elétrica, 1993

Computational Intelligence

Conference paper · preferred

Redes Neurais Artificiais para Representação de Conhecimento Médico em Anestesiologia

Jurandir Paz Oliveira, Renato Garcia Ojeda, Ricardo Felipe Custodio, Walter Celso de Lima

X Congresso Chileno de Engenharia Elétrica, 1993

Computational Intelligence

Conference paper · preferred

Scientific Computing & Instrumentation (6)

A Computação Algébrica no Ensino

Sérgio Peters, Ricardo Felipe Custodio, Rita Eger, Nelcy Mendonça

XIX Congresso Nacional de Matematica Aplicada e Computacional, 1996

Scientific Computing & Instrumentation

Conference paper · preferred

Metodo da Iteraçao Dinâmica para a Determinaçãoo de Zeros de Funções

Ricardo Felipe Custodio, Milton P. de Borba

XVII Congresso Nacional de Matematica Aplicada e Computacional, 1994

Scientific Computing & Instrumentation

Conference paper · preferred

Poligraph as a Virtual Instrumentation

Julíbio David Ardigo, Carlos Ignácio Zanchin, Walter Celso de Lima, Ricardo Felipe Custodio

Physics in Medicine & Biology, 1994

Scientific Computing & Instrumentation

Conference paper · preferred

Regula - Um CAD para o projeto de Fontes de Alimentação com Reguladores Integrados

Francisco Olegário Müller Neto, Ricardo Felipe Custodio, Carlos Ignácio Zanchin, João da Silva Dias

X Congresso Chileno de Engenharia Elétrica, 1993

Scientific Computing & Instrumentation

Conference paper · preferred

Sistema Optoeletrônico de Medição de Posição por Triangulação

João da Silva Dias, Ricardo Felipe Custodio, Carlos Ignácio Zanchin, Fernando Passold

X Congresso Chileno de Engenharia Elétrica, 1993

Scientific Computing & Instrumentation

Conference paper · preferred

Prototipação de Sistemas a Partir da Definição da Interface Homem Máquina

Marcos Wilson Costa de Aguiar, Ricardo Felipe Custodio, Roque Volkmer

V Reunião de Trabalho do Projeto ESTRA - Estação de Trabalho Avançada, 1989

Scientific Computing & Instrumentation

Conference paper · preferred

Research Foundations

Cryptography (59)

Anamorphic Construction For The Winternitz OTS Scheme Family

Lucas Mayr, Jo\~ao Gabriel Feres, Bruno Bianchi Pagani, Ricardo Cust\'odio

IACR Cryptol. ePrint Arch., 2026

Post-Quantum Cryptography Digital Signatures Cryptography

IACR ePrint · preferred

Cryptographic Applications of Combinatorial Ranking for Integer Compositions

Gustavo Zambonin, Larissa Gremelmaier Rosa, Ricardo Cust\'odio, Daniel Panario

Combinatorial Algorithms - 37th International Workshop, IWOCA 2026, Clermont-Ferrand, France, June 8-11, 2026, Proceedings, 2026

Cryptography

Conference paper · preferred

Redefining Digital Web Signature Secrecy: A Client-Side Model for Enhanced Security and Compliance

Wellington Fernandes Silvano, Lucas Mayr, Enzo Brum, Gabriel Cabral, Frederico Schardong, Ricardo Cust\'odio

J. Braz. Comput. Soc., 2026

Digital Signatures Cryptography

Journal article · preferred

From ElGamal to Lattice-Based: Enhancing Helios Voting with Quantum-Safe Cryptography

Jo\~ao Pedro Cardoso Barbosa, Gustavo Zambonin, Tha\'\is Bardini Idalino, Ricardo Felipe Cust\'odio

Applied Cryptography and Network Security - 23rd International Conference, ACNS 2025, Munich, Germany, June 23-26, 2025, Proceedings, Part III, 2025

Post-Quantum Cryptography Electronic Voting Cryptography

Conference paper · preferred

The Open Paradigm: A Systematic Analysis of Evolutionary Frameworks and Cross-Sectoral Applications in Data-Driven Ecosystems

COELHO, LUCIANO FIGUEIREDO, Ricardo Felipe Custodio, MATOS, MANUEL

IOSR Journal of Business and Management, 2025

Electronic Voting Cryptography

Journal article · preferred

A Concrete LIP-Based KEM With Simple Lattices

Gustavo de Castro Biage, Gustavo Zambonin, Tha\'\is Bardini Idalino, Daniel Panario, Ricardo Felipe Cust\'odio

IEEE Access, 2024

Post-Quantum Cryptography Cryptography

Journal article · preferred

Automated Issuance of Post-Quantum Certificates: A New Challenge

Alexandre Augusto Giron, Frederico Schardong, Lucas Pandolfo Perin, Ricardo Cust\'odio, Victor Valle, V\'\ictor Mateu

Applied Cryptography and Network Security - 22nd International Conference, ACNS 2024, Abu Dhabi, United Arab Emirates, March 5-8, 2024, Proceedings, Part II, 2024

Post-Quantum Cryptography Public-Key Infrastructure Cryptography

Conference paper · preferred IACR ePrint

Probabilistic root finding in code-based cryptography

D\'unia Marchiori, Ricardo Cust\'odio, Daniel Panario, Lucia Moura

J. Cryptogr. Eng., 2024

Post-Quantum Cryptography Finite-Field Arithmetic Cryptography

Journal article · preferred

Proposal of an Electronic Auditing System Applied to the Brazilian Electronic Voting Machine

Marcelo Ferreira Guimar\~aes, Carlos Ant\^onio Sell, Renato Parenti Turcato, Carlos Henrique Assuiti, Ricardo Cust\'odio, Ricardo Ant\^onio Pralon Santos

CoRR, 2024

Electronic Voting Cryptography

arXiv / CoRR · preferred

Seamless Transition to Post-Quantum TLS 1.3: A Hybrid Approach Using Identity-Based Encryption

ASTRIZI , THIAGO LEUCZ, Ricardo Felipe Custodio

SENSORS, 2024

Post-Quantum Cryptography Digital Identity Cryptography

Journal article · preferred

Monitoring Key Pair Usage through Distributed Ledgers and One-Time Signatures

Lucas Mayr, Lucas M. Palma, Gustavo Zambonin, Wellington Silvano, Ricardo Cust\'odio

Inf., 2023

Digital Signatures Cryptography

Journal article · preferred

Post-quantum Hybrid KEMTLS Performance in Simulated and Real Network Environments

Alexandre Augusto Giron, Jo\~ao Pedro Adami do Nascimento, Ricardo Cust\'odio, Lucas Pandolfo Perin, V\'\ictor Mateu

Progress in Cryptology - LATINCRYPT 2023 - 8th International Conference on Cryptology and Information Security in Latin America, LATINCRYPT 2023, Quito, Ecuador, October 3-6, 2023, Proceedings, 2023

Post-Quantum Cryptography Cryptography

Conference paper · preferred IACR ePrint

Post-quantum hybrid key exchange: a systematic mapping study

Alexandre Augusto Giron, Ricardo Cust\'odio, Francisco Rodr\'\iguez-Henr\'\iquez

J. Cryptogr. Eng., 2023

Post-Quantum Cryptography Cryptography

Journal article · preferred

Quantum Threats to the TLS 1.3 Protocol

Luiz Filipi Anderson de Sousa Moura, GIRON, ALEXANDRE A., Ricardo Felipe Custodio

SECURWARE 2023 - The Seventeenth International Conference on Emerging Security Information, Systems and Technologies, 2023

Cryptography Post-Quantum Cryptography

Conference paper · preferred

Leveraging Self-Sovereign Identity, Blockchain, and Zero-Knowledge Proof to Build a Privacy-Preserving Vaccination Pass

Maur\'\icio de Vasconcelos Barros, Frederico Schardong, Ricardo Felipe Cust\'odio

CoRR, 2022

Digital Identity Cryptography Electronic Documents

arXiv / CoRR · preferred

Post-Quantum Electronic Identity: Adapting OpenID Connect and OAuth 2.0 to the Post-Quantum Era

Frederico Schardong, Alexandre Augusto Giron, Fernanda Larisa M\"uller, Ricardo Cust\'odio

Cryptology and Network Security - 21st International Conference, CANS 2022, Dubai, United Arab Emirates, November 13-16, 2022, Proceedings, 2022

Post-Quantum Cryptography Digital Identity Cryptography

Conference paper · preferred

Redacting Blockchain Without Exposing Chameleon Hash Collisions

Thiago Leucz Astrizi, Ricardo Cust\'odio

Cryptology and Network Security - 21st International Conference, CANS 2022, Dubai, United Arab Emirates, November 13-16, 2022, Proceedings, 2022

Cryptography

Conference paper · preferred

Simplifying Electronic Document Digital Signatures

Lucas Mayr, Frederico Schardong, Ricardo Felipe Cust\'odio

CoRR, 2022

Digital Signatures Electronic Documents Cryptography

arXiv / CoRR · preferred

TLS 1.3 Handshake Analyzer

Giron, Alexandre Augusto, SCHARDONG, FREDERICO, Ricardo Felipe Custodio

Anais Estendidos do XXII Simpósio Brasileiro de Segurança da Informação e de Sistemas Computacionais (SBSeg Estendido 2022), 2022

Networks, Distributed Systems & Security Cryptography

Conference paper · preferred

Improved constant-sum encodings for hash-based signatures

Lucas Pandolfo Perin, Gustavo Zambonin, Ricardo Felipe Cust\'odio, Lucia Moura, Daniel Panario

J. Cryptogr. Eng., 2021

Digital Signatures Cryptography

Journal article · preferred

Steganographic Analysis of Blockchains

Alexandre Augusto Giron, Jean Everson Martina, Ricardo Felipe Cust\'odio

Sensors, 2021

Cryptography

Journal article · preferred

Timing Analysis of Algorithm Substitution Attacks in a Post-Quantum TLS Protocol

MARCHIORI, DÚNIA, GIRON, ALEXANDRE A., NASCIMENTO, JOÃO PEDRO A. DO, Ricardo Felipe Custodio

Anais do XXI Simpósio Brasileiro de Segurança da Informação e de Sistemas Computacionais (SBSeg 2021), 2021

Post-Quantum Cryptography Cryptography

Conference paper · preferred

Towards constant-time probabilistic root finding for code-based cryptography

MARCHIORI, DÚNIA, Ricardo Felipe Custodio, PANARIO, DANIEL, MOURA, LUCIA

Anais do XXI Simpósio Brasileiro de Segurança da Informação e de Sistemas Computacionais (SBSeg 2021), 2021

Post-Quantum Cryptography Finite-Field Arithmetic Cryptography

Conference paper · preferred

An Entropy Source based on the Bluetooth Received Signal Strength Indicator

Giron, Alexandre Augusto, Ricardo Felipe Custodio

Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2020

Cryptography

Conference paper · preferred

Bitcoin Blockchain Steganographic Analysis

Alexandre Augusto Giron, Jean Everson Martina, Ricardo Felipe Cust\'odio

Applied Cryptography and Network Security Workshops - ACNS 2020 Satellite Workshops, AIBlock, AIHWS, AIoTS, Cloud S&P, SCI, SecMT, and SiMLA, Rome, Italy, October 19-22, 2020, Proceedings, 2020

Cryptography

Conference paper · preferred

Post-quantum signature with preimage chameleon hashing

Thiago Astrizi, Ricardo Felipe Custodio, Lucia Moura

XX Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2020

Post-Quantum Cryptography Cryptography Digital Signatures

Conference paper · preferred

A new class of irreducible pentanomials for polynomial-based multipliers in binary fields

Gustavo Banegas, Ricardo Felipe Cust\'odio, Daniel Panario

J. Cryptogr. Eng., 2019

Finite-Field Arithmetic Cryptography

Journal article · preferred arXiv / CoRR IACR ePrint

Don't Forget Your Roots: Constant-Time Root Finding over \textbackslashmathbb F\_2\^m F 2 m

Douglas Marcelino Beppler Martins, Gustavo Banegas, Ricardo Felipe Cust\'odio

Progress in Cryptology - LATINCRYPT 2019 - 6th International Conference on Cryptology and Information Security in Latin America, Santiago de Chile, Chile, October 2-4, 2019, Proceedings, 2019

Finite-Field Arithmetic Cryptography

Conference paper · preferred IACR ePrint Conference paper

Handling Vinegar Variables to Shorten Rainbow Key Pairs

Gustavo Zambonin, Matheus S. P. Bittencourt, Ricardo Felipe Cust\'odio

Progress in Cryptology - AFRICACRYPT 2019 - 11th International Conference on Cryptology in Africa, Rabat, Morocco, July 9-11, 2019, Proceedings, 2019

Post-Quantum Cryptography Cryptography

Conference paper · preferred

Fast modular reduction and squaring in \emphGF(2\(^\mbox\emphm\))

Lucas Boppre Niehues, Ricardo Felipe Cust\'odio, Daniel Panario

Inf. Process. Lett., 2018

Finite-Field Arithmetic Cryptography

Journal article · preferred

Secret Sharing Schemes with Hidden Sets

Rick Lopes de Souza, Mart\'\in Augusto Gagliotti Vigil, Ricardo Felipe Cust\'odio, Florian Caullery, Lucia Moura, Daniel Panario

2018 IEEE Symposium on Computers and Communications, ISCC 2018, Natal, Brazil, June 25-28, 2018, 2018

Cryptography

Conference paper · preferred

Tuning the Winternitz hash-based digital signature scheme

Lucas Pandolfo Perin, Gustavo Zambonin, Douglas Marcelino Beppler Martins, Ricardo Felipe Cust\'odio, Jean Everson Martina

2018 IEEE Symposium on Computers and Communications, ISCC 2018, Natal, Brazil, June 25-28, 2018, 2018

Post-Quantum Cryptography Digital Signatures Cryptography

Conference paper · preferred

Análise de Vulnerabilidade de Esquemas de Segredo Compartilhado Considerando um novo Modelo de Ameaça

Rick Lopes de Souza, Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio

XVII Simpo&\#769;sio Brasileiro de Seguranc&\#807;a da Informac&\#807;a&\#771;o e de Sistemas Computacionais - SBSeg 2017, 2017

Cryptography

Conference paper · preferred

Formulas for pth root computations in finite fields of characteristic p

PERIN, L.P., Ricardo Felipe Custodio, Daniel Panario, WANG, Q.

Electronics Letters (Online), 2016

Finite-Field Arithmetic Cryptography

Journal article · preferred

Locating modifications in signed data for partial data integrity

Tha\'\is Bardini Idalino, Lucia Moura, Ricardo Felipe Cust\'odio, Daniel Panario

Inf. Process. Lett., 2015

Digital Signatures Electronic Documents Cryptography

Journal article · preferred arXiv / CoRR

A User-Centric Digital Signature Scheme

Felipe Carlos Werlang, Ricardo Felipe Cust\'odio, Mart\'\in Augusto Gagliotti Vigil

Public Key Infrastructures, Services and Applications - 10th European Workshop, EuroPKI 2013, Egham, UK, September 12-13, 2013, Revised Selected Papers, 2013

Digital Signatures Public-Key Infrastructure Cryptography

Conference paper · preferred

An Attribute-Based Public Key Infrastructure

Hendri Nogueira, Ricardo Felipe Custodio, Jean Everson Martina

International Journal of Computer Science and Information Security, 2013

Public-Key Infrastructure Digital Identity Electronic Voting Cryptography

Journal article · preferred

A Proposed Framework for Analysing Security Ceremonies

Marcelo Carlomagno Carlos, Jean Everson Martina, Geraint Price, Ricardo Felipe Cust\'odio

SECRYPT 2012 - Proceedings of the International Conference on Security and Cryptography, Rome, Italy, 24-27 July, 2012, SECRYPT is part of ICETE - The International Joint Conference on e-Business and Telecommunications, 2012

Security Ceremonies Cryptography

Conference paper · preferred

Cleaning up the PKI for Long-term Signatures

Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio

XII SBSeg 2012, 2012

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

The Notary Based PKI - A Lightweight PKI for Long-Term Signatures on Documents

Mart\'\in Augusto Gagliotti Vigil, Cristian Thiago Moecke, Ricardo Felipe Cust\'odio, Melanie Volkamer

Public Key Infrastructures, Services and Applications - 9th European Workshop, EuroPKI 2012, Pisa, Italy, September 13-14, 2012, Revised Selected Papers, 2012

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred Conference paper

Towards a Formal Verification of a Multi-factor Authentication Protocol Using Automated Theorem Provers

Eduardo dos Santos, Jean Everson Martina, Ricardo Felipe Cust\'odio

11th IEEE International Conference on Trust, Security and Privacy in Computing and Communications, TrustCom 2012, Liverpool, United Kingdom, June 25-27, 2012, 2012

Digital Identity Cryptography

Conference paper · preferred

Carimbos do Tempo Autenticados para a Preservação por Longo Prazo de Assinaturas Digitais

Nelson da Silva, Thiago Acórdi Ramos, Ricardo Felipe Custodio

XI SBSEG, 2011

Electronic Documents Digital Signatures Digital Identity Cryptography

Conference paper · preferred

Electronic Documents with Signature Constraints

Felipe Carlos Werlang, Ricardo Felipe Custodio, Roberto Samarone dos Santos Araújo

I WGID, 2011

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

A Verifiable Voting Protocol Based on Farnel

Roberto Ara\'ujo, Ricardo Felipe Cust\'odio, Jeroen van de Graaf

Towards Trustworthy Elections, New Directions in Electronic Voting, 2010

Electronic Voting Cryptography

Conference paper · preferred IACR ePrint

Infra-estrutura de Chaves Públicas Otimizada: Uma ICP de Suporte a Assinaturas Eficientes para Documentos Eletrônicos

Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio, Ricardo Alexandre Reinaldo de Moraes

IX Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2009

Electronic Documents Public-Key Infrastructure Digital Signatures Cryptography

Conference paper · preferred

Optimized Certificates - A New Proposal for Efficient Electronic Document Signature Validation

Ricardo Felipe Cust\'odio, Mart\'\in Augusto Gagliotti Vigil, Juliano Romani, Fernando Carlos Pereira, Joni da Silva Fraga

Public Key Infrastructure, 5th European PKI Workshop: Theory and Practice, EuroPKI 2008, Trondheim, Norway, June 16-17, 2008, Proceedings, 2008

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Certificados Otimizados para a validação eficiente da Assinatura Digital

Adriana Elissa Notoya, Ricardo Felipe Custodio, Fernando Carlos Pereira, Joni da Silva Fraga

VII Certificados Otimizados para a validação eficiente da Assinatura Digital, 2007

Public-Key Infrastructure Digital Signatures Cryptography

Conference paper · preferred

OpenHSM: An Open Key Life Cycle Protocol for Public Key Infrastructure's Hardware Security Modules

Jean Everson Martina, T\'ulio Cicero Salvaro de Souza, Ricardo Felipe Cust\'odio

Public Key Infrastructure, 4th European PKI Workshop: Theory and Practice, EuroPKI 2007, Palma de Mallorca, Spain, June 28-30, 2007, Proceedings, 2007

Public-Key Infrastructure Cryptography

Conference paper · preferred

An Electronic Scheme for the Farnel Paper-Based Voting Protocol

Roberto Samarone dos Santos Araújo, Ricardo Felipe Custodio, A. Wiesmaier, T. Takagi

4th International Conference on Applied Cryptography and Network Security (ACNS'06), 2006

Electronic Voting Cryptography

Conference paper · preferred

Denúncia Anônima Segura

Fernando Cézar de Oliveira Lopes, Ricardo Felipe Custodio

Revista do IST, 2004

Privacy & Secure Information Sharing Cryptography

Journal article · preferred

Execução Segura de Assinaturas Confiáveis em Documentos Eletrônicos

Júlio da Silva Dias, Jean Everson Martina, Ricardo Felipe Custodio, Daniel Santana de Freitas

SBRC 2004, 2004

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Assinatura Confiável de Documentos Eletrônicos

Júlio da Silva Dias, Ricardo Felipe Custodio, Carlos Roberto de Rolt

WSeg-2003, 2003

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Ostracon: Um Sistema de Votação Digital pela Internet

Fabiano Castro Pereira, Ricardo Felipe Custodio

SBRC-2003, WSeg-2003, 2003

Electronic Voting Cryptography

Conference paper · preferred

Protocolo Criptográfico para Envio de Propostas em Processos de Compras

Fernando Carlos Pereira, Ricardo Felipe Custodio, Adriana Elissa Notoya

Anais do V SSI 2003, 2003

Cryptography

Conference paper · preferred

Sistema Seguro para Assinatura de Documentos Eletrônicos

Júlio da Silva Dias, Ricardo Felipe Custodio, Carlos Roberto de Rolt

Anais do IADIS WWW/internet 2003, 2003

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Assinatura Digital de Documentos Eletrônicos através da Impressão Digital

Juliano Fontoura Kazienko, Felipe Pompeo Pereira, Ricardo Felipe Custodio

XII Seminário Regional de Informática, 2002

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Farnel: Um protocolo Criptográficos para Votação Digital

Ricardo Felipe Custodio, Roberto Samarone dos Santos Araújo, Augusto Jun Devegili

WSeg 2002, 2002

Electronic Voting Cryptography

Conference paper · preferred

Um Protocolo Criptográfico para Comunicação Anônima Segura

Paulo Sérgio Ribeiro, Ricardo Felipe Custodio

WSeg 2002, 2002

Cryptography Privacy & Secure Information Sharing

Conference paper · preferred

Fundamentos de Criptografia

Luiz Carlos Zancanella, Ricardo Felipe Custodio, Daniel Santa Freitas

IX Escola de Informática da SBC-Sul, 2001

Cryptography

Conference paper · preferred

Finite-Field Arithmetic (6)

Probabilistic root finding in code-based cryptography

D\'unia Marchiori, Ricardo Cust\'odio, Daniel Panario, Lucia Moura

J. Cryptogr. Eng., 2024

Post-Quantum Cryptography Finite-Field Arithmetic Cryptography

Journal article · preferred

Towards constant-time probabilistic root finding for code-based cryptography

MARCHIORI, DÚNIA, Ricardo Felipe Custodio, PANARIO, DANIEL, MOURA, LUCIA

Anais do XXI Simpósio Brasileiro de Segurança da Informação e de Sistemas Computacionais (SBSeg 2021), 2021

Post-Quantum Cryptography Finite-Field Arithmetic Cryptography

Conference paper · preferred

A new class of irreducible pentanomials for polynomial-based multipliers in binary fields

Gustavo Banegas, Ricardo Felipe Cust\'odio, Daniel Panario

J. Cryptogr. Eng., 2019

Finite-Field Arithmetic Cryptography

Journal article · preferred arXiv / CoRR IACR ePrint

Don't Forget Your Roots: Constant-Time Root Finding over \textbackslashmathbb F\_2\^m F 2 m

Douglas Marcelino Beppler Martins, Gustavo Banegas, Ricardo Felipe Cust\'odio

Progress in Cryptology - LATINCRYPT 2019 - 6th International Conference on Cryptology and Information Security in Latin America, Santiago de Chile, Chile, October 2-4, 2019, Proceedings, 2019

Finite-Field Arithmetic Cryptography

Conference paper · preferred IACR ePrint Conference paper

Fast modular reduction and squaring in \emphGF(2\(^\mbox\emphm\))

Lucas Boppre Niehues, Ricardo Felipe Cust\'odio, Daniel Panario

Inf. Process. Lett., 2018

Finite-Field Arithmetic Cryptography

Journal article · preferred

Formulas for pth root computations in finite fields of characteristic p

PERIN, L.P., Ricardo Felipe Custodio, Daniel Panario, WANG, Q.

Electronics Letters (Online), 2016

Finite-Field Arithmetic Cryptography

Journal article · preferred

Security & Privacy

Privacy & Secure Information Sharing (7)

Privacy information in a positive credit system

Marcelo Luiz Brocardo, Carlos Roberto De Rolt, Julio Da Silva Dias, Ricardo Felipe Cust\'odio, Issa Traor\'e

Int. J. Grid Util. Comput., 2017

Privacy & Secure Information Sharing

Journal article · preferred

Sharing Privacy Information in Credit Analysis Environment

Marcelo Luiz Brocardo, Ricardo Felipe Cust\'odio, Carlos Roberto De Rolt, Julio Da Silva Dias, Issa Traor\'e

Ninth International Conference on Complex, Intelligent, and Software Intensive Systems, CISIS 2015, Santa Catarina, Brazil, July 8-10, 2015, 2015

Privacy & Secure Information Sharing

Conference paper · preferred

CloudSec - Um Middleware para Compartilhamento de Informações Sigilosas em Nuvens Computacionais

Rick Lopes de Souza, Hylson Vescovi Netto, Lau Cheuk Lung, Ricardo Felipe Custodio

VIV Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2014

Privacy & Secure Information Sharing

Conference paper · preferred

Efficient Data Integrity Checking for Untrusted Database Systems

Anderson Luiz Silverio, Ricardo Felipe Custodio, Marcelo Carlomagno Carlos, Ronaldo dos Santos Mello

The Sixth International Conference on Advances in Databases, Knowledge, and Data Applications, 2014

Privacy & Secure Information Sharing

Conference paper · preferred

SSICC: Sharing Sensitive Information in a Cloud-of-Clouds

Rick Lopes de Souza, Hylson Vescovi Netto, Lau Cheuk Lung, Ricardo Felipe Custodio

ICONS 2014, The Ninth International Conference on Systems, 2014

Privacy & Secure Information Sharing

Conference paper · preferred

Denúncia Anônima Segura

Fernando Cézar de Oliveira Lopes, Ricardo Felipe Custodio

Revista do IST, 2004

Privacy & Secure Information Sharing Cryptography

Journal article · preferred

Um Protocolo Criptográfico para Comunicação Anônima Segura

Paulo Sérgio Ribeiro, Ricardo Felipe Custodio

WSeg 2002, 2002

Cryptography Privacy & Secure Information Sharing

Conference paper · preferred

All Publications

Each canonical scholarly work is listed once. Preprints, ePrints, and other manifestations are shown as versions of the same work.

2026

Anamorphic Construction For The Winternitz OTS Scheme Family

Lucas Mayr, Jo\~ao Gabriel Feres, Bruno Bianchi Pagani, Ricardo Cust\'odio

IACR Cryptol. ePrint Arch., 2026

Post-Quantum Cryptography Digital Signatures Cryptography

IACR ePrint · preferred

Cryptographic Applications of Combinatorial Ranking for Integer Compositions

Gustavo Zambonin, Larissa Gremelmaier Rosa, Ricardo Cust\'odio, Daniel Panario

Combinatorial Algorithms - 37th International Workshop, IWOCA 2026, Clermont-Ferrand, France, June 8-11, 2026, Proceedings, 2026

Cryptography

Conference paper · preferred

Redefining Digital Web Signature Secrecy: A Client-Side Model for Enhanced Security and Compliance

Wellington Fernandes Silvano, Lucas Mayr, Enzo Brum, Gabriel Cabral, Frederico Schardong, Ricardo Cust\'odio

J. Braz. Comput. Soc., 2026

Digital Signatures Cryptography

Journal article · preferred

2025

Automation and Risk: Transformers Models Reshape Sensitive Information Management

Wellington Fernandes Silvano, Maur\'\icio Konrath, Lucas Mayr, Ricardo Felipe Cust\'odio

Information Systems Security - 21st International Conference, ICISS 2025, Indore, India, December 16-20, 2025, Proceedings, 2025

AI & Security

Conference paper · preferred

From ElGamal to Lattice-Based: Enhancing Helios Voting with Quantum-Safe Cryptography

Jo\~ao Pedro Cardoso Barbosa, Gustavo Zambonin, Tha\'\is Bardini Idalino, Ricardo Felipe Cust\'odio

Applied Cryptography and Network Security - 23rd International Conference, ACNS 2025, Munich, Germany, June 23-26, 2025, Proceedings, Part III, 2025

Post-Quantum Cryptography Electronic Voting Cryptography

Conference paper · preferred

Inteligência Artificial no Registro Civil do Brasil

Gustavo Rentato Fiscarelli, Luis Carlos Vendramin Junior, Ricardo Felipe Custodio

Editora Método, 2025

Electronic Documents AI & Security

Book · preferred

Limits and Surprises of Cross-Lingual BERT Under Data Scarcity: A Portuguese Case Study in Sensitive-Text Classification

Wellington Fernandes Silvano, Maur\'\icio Konrath, Ricardo Felipe Cust\'odio

Advances in Soft Computing - 24th Mexican International Conference on Artificial Intelligence, MICAI 2025, Guanajuato, Mexico, November 3, 2025, Proceedings, Part II, 2025

AI & Security

Conference paper · preferred

Rethinking GAN-BERT for Sensitive Text Classification: The Impact of Training Dynamics and Domain Alignment in Low-Data Scenarios

Wellington Fernandes Silvano, Maur\'\icio Konrath, Ricardo Felipe Cust\'odio

Advances in Soft Computing - 24th Mexican International Conference on Artificial Intelligence, MICAI 2025, Guanajuato, Mexico, November 3, 2025, Proceedings, Part II, 2025

AI & Security

Conference paper · preferred

The Open Paradigm: A Systematic Analysis of Evolutionary Frameworks and Cross-Sectoral Applications in Data-Driven Ecosystems

COELHO, LUCIANO FIGUEIREDO, Ricardo Felipe Custodio, MATOS, MANUEL

IOSR Journal of Business and Management, 2025

Electronic Voting Cryptography

Journal article · preferred

2024

A Concrete LIP-Based KEM With Simple Lattices

Gustavo de Castro Biage, Gustavo Zambonin, Tha\'\is Bardini Idalino, Daniel Panario, Ricardo Felipe Cust\'odio

IEEE Access, 2024

Post-Quantum Cryptography Cryptography

Journal article · preferred

Automated Issuance of Post-Quantum Certificates: A New Challenge

Alexandre Augusto Giron, Frederico Schardong, Lucas Pandolfo Perin, Ricardo Cust\'odio, Victor Valle, V\'\ictor Mateu

Applied Cryptography and Network Security - 22nd International Conference, ACNS 2024, Abu Dhabi, United Arab Emirates, March 5-8, 2024, Proceedings, Part II, 2024

Post-Quantum Cryptography Public-Key Infrastructure Cryptography

Conference paper · preferred IACR ePrint

From Self-Sovereign Identity to Fiduciary Identity: A Journey Towards Greater User Privacy and Usability

Frederico Schardong, Ricardo Cust\'odio

Proceedings of the 39th ACM/SIGAPP Symposium on Applied Computing, SAC 2024, Avila, Spain, April 8-12, 2024, 2024

Digital Identity

Conference paper · preferred

Probabilistic root finding in code-based cryptography

D\'unia Marchiori, Ricardo Cust\'odio, Daniel Panario, Lucia Moura

J. Cryptogr. Eng., 2024

Post-Quantum Cryptography Finite-Field Arithmetic Cryptography

Journal article · preferred

Proposal of an Electronic Auditing System Applied to the Brazilian Electronic Voting Machine

Marcelo Ferreira Guimar\~aes, Carlos Ant\^onio Sell, Renato Parenti Turcato, Carlos Henrique Assuiti, Ricardo Cust\'odio, Ricardo Ant\^onio Pralon Santos

CoRR, 2024

Electronic Voting Cryptography

arXiv / CoRR · preferred

Seamless Transition to Post-Quantum TLS 1.3: A Hybrid Approach Using Identity-Based Encryption

ASTRIZI , THIAGO LEUCZ, Ricardo Felipe Custodio

SENSORS, 2024

Post-Quantum Cryptography Digital Identity Cryptography

Journal article · preferred

The Role-Artifact-Function Framework for Understanding Digital Identity Models

Frederico Schardong, Ricardo Cust\'odio

Conceptual Modeling - 43rd International Conference, ER 2024, Pittsburgh, PA, USA, October 28-31, 2024, Proceedings, 2024

Digital Identity

Conference paper · preferred

2023

Monitoring Key Pair Usage through Distributed Ledgers and One-Time Signatures

Lucas Mayr, Lucas M. Palma, Gustavo Zambonin, Wellington Silvano, Ricardo Cust\'odio

Inf., 2023

Digital Signatures Cryptography

Journal article · preferred

Post-quantum Hybrid KEMTLS Performance in Simulated and Real Network Environments

Alexandre Augusto Giron, Jo\~ao Pedro Adami do Nascimento, Ricardo Cust\'odio, Lucas Pandolfo Perin, V\'\ictor Mateu

Progress in Cryptology - LATINCRYPT 2023 - 8th International Conference on Cryptology and Information Security in Latin America, LATINCRYPT 2023, Quito, Ecuador, October 3-6, 2023, Proceedings, 2023

Post-Quantum Cryptography Cryptography

Conference paper · preferred IACR ePrint

Post-quantum hybrid key exchange: a systematic mapping study

Alexandre Augusto Giron, Ricardo Cust\'odio, Francisco Rodr\'\iguez-Henr\'\iquez

J. Cryptogr. Eng., 2023

Post-Quantum Cryptography Cryptography

Journal article · preferred

Quantum Threats to the TLS 1.3 Protocol

Luiz Filipi Anderson de Sousa Moura, GIRON, ALEXANDRE A., Ricardo Felipe Custodio

SECURWARE 2023 - The Seventeenth International Conference on Emerging Security Information, Systems and Technologies, 2023

Cryptography Post-Quantum Cryptography

Conference paper · preferred

2022

Leveraging Self-Sovereign Identity, Blockchain, and Zero-Knowledge Proof to Build a Privacy-Preserving Vaccination Pass

Maur\'\icio de Vasconcelos Barros, Frederico Schardong, Ricardo Felipe Cust\'odio

CoRR, 2022

Digital Identity Cryptography Electronic Documents

arXiv / CoRR · preferred

Post-Quantum Electronic Identity: Adapting OpenID Connect and OAuth 2.0 to the Post-Quantum Era

Frederico Schardong, Alexandre Augusto Giron, Fernanda Larisa M\"uller, Ricardo Cust\'odio

Cryptology and Network Security - 21st International Conference, CANS 2022, Dubai, United Arab Emirates, November 13-16, 2022, Proceedings, 2022

Post-Quantum Cryptography Digital Identity Cryptography

Conference paper · preferred

Redacting Blockchain Without Exposing Chameleon Hash Collisions

Thiago Leucz Astrizi, Ricardo Cust\'odio

Cryptology and Network Security - 21st International Conference, CANS 2022, Dubai, United Arab Emirates, November 13-16, 2022, Proceedings, 2022

Cryptography

Conference paper · preferred

Self-Sovereign Identity: A Systematic Review, Mapping and Taxonomy

Frederico Schardong, Ricardo Cust\'odio

Sensors, 2022

Digital Identity

Journal article · preferred

Simplifying Electronic Document Digital Signatures

Lucas Mayr, Frederico Schardong, Ricardo Felipe Cust\'odio

CoRR, 2022

Digital Signatures Electronic Documents Cryptography

arXiv / CoRR · preferred

TLS 1.3 Handshake Analyzer

Giron, Alexandre Augusto, SCHARDONG, FREDERICO, Ricardo Felipe Custodio

Anais Estendidos do XXII Simpósio Brasileiro de Segurança da Informação e de Sistemas Computacionais (SBSeg Estendido 2022), 2022

Networks, Distributed Systems & Security Cryptography

Conference paper · preferred

Touchless Authentication for Health Professionals: Analyzing the Risks and Proposing Alternatives to Dirty Interfaces

Chiarelli Ara\'ujo Vale, Frederico Schardong, Maur\'\icio de Vasconcelos Barros, Ricardo Cust\'odio

35th IEEE International Symposium on Computer-Based Medical Systems, CBMS 2022, Shenzen, China, July 21-23, 2022, 2022

Electronic Documents Digital Identity

Conference paper · preferred

2021

Improved constant-sum encodings for hash-based signatures

Lucas Pandolfo Perin, Gustavo Zambonin, Ricardo Felipe Cust\'odio, Lucia Moura, Daniel Panario

J. Cryptogr. Eng., 2021

Digital Signatures Cryptography

Journal article · preferred

Matching Metadata on Blockchain for Self-Sovereign Identity

Frederico Schardong, Ricardo Felipe Cust\'odio, La\'ercio Pioli, Jo\~ao Vicente Meyer

Business Process Management Workshops - BPM 2021 International Workshops, Rome, Italy, September 6-10, 2021, Revised Selected Papers, 2021

Digital Identity

Conference paper · preferred

Self-Sovereign Identity: A Systematic Map and Review

Frederico Schardong, Ricardo Felipe Cust\'odio

CoRR, 2021

Digital Identity

arXiv / CoRR · preferred

Steganographic Analysis of Blockchains

Alexandre Augusto Giron, Jean Everson Martina, Ricardo Felipe Cust\'odio

Sensors, 2021

Cryptography

Journal article · preferred

Timing Analysis of Algorithm Substitution Attacks in a Post-Quantum TLS Protocol

MARCHIORI, DÚNIA, GIRON, ALEXANDRE A., NASCIMENTO, JOÃO PEDRO A. DO, Ricardo Felipe Custodio

Anais do XXI Simpósio Brasileiro de Segurança da Informação e de Sistemas Computacionais (SBSeg 2021), 2021

Post-Quantum Cryptography Cryptography

Conference paper · preferred

Towards constant-time probabilistic root finding for code-based cryptography

MARCHIORI, DÚNIA, Ricardo Felipe Custodio, PANARIO, DANIEL, MOURA, LUCIA

Anais do XXI Simpósio Brasileiro de Segurança da Informação e de Sistemas Computacionais (SBSeg 2021), 2021

Post-Quantum Cryptography Finite-Field Arithmetic Cryptography

Conference paper · preferred

2020

An Entropy Source based on the Bluetooth Received Signal Strength Indicator

Giron, Alexandre Augusto, Ricardo Felipe Custodio

Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2020

Cryptography

Conference paper · preferred

Bitcoin Blockchain Steganographic Analysis

Alexandre Augusto Giron, Jean Everson Martina, Ricardo Felipe Cust\'odio

Applied Cryptography and Network Security Workshops - ACNS 2020 Satellite Workshops, AIBlock, AIHWS, AIoTS, Cloud S&P, SCI, SecMT, and SiMLA, Rome, Italy, October 19-22, 2020, Proceedings, 2020

Cryptography

Conference paper · preferred

Post-quantum signature with preimage chameleon hashing

Thiago Astrizi, Ricardo Felipe Custodio, Lucia Moura

XX Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2020

Post-Quantum Cryptography Cryptography Digital Signatures

Conference paper · preferred

2019

A new class of irreducible pentanomials for polynomial-based multipliers in binary fields

Gustavo Banegas, Ricardo Felipe Cust\'odio, Daniel Panario

J. Cryptogr. Eng., 2019

Finite-Field Arithmetic Cryptography

Journal article · preferred arXiv / CoRR IACR ePrint

Certi¿cado Digital Acadêmico na Nuvem

MARTINA, JEAN, PEREIRA, FERNANDO, PIERI, GIOVANI, BEZERRA, ROQUE, CORDEIRO, LUIS, MEURER, LEONARDO, GERÔNIMO, GUILHERME, Ricardo Felipe Custodio, Douglas Martins, MACELAI, VINICIUS

Anais do IX Workshop de Gestão de Identidades Digitais (WGID 2019), 2019

Digital Identity

Conference paper · preferred

Don't Forget Your Roots: Constant-Time Root Finding over \textbackslashmathbb F\_2\^m F 2 m

Douglas Marcelino Beppler Martins, Gustavo Banegas, Ricardo Felipe Cust\'odio

Progress in Cryptology - LATINCRYPT 2019 - 6th International Conference on Cryptology and Information Security in Latin America, Santiago de Chile, Chile, October 2-4, 2019, Proceedings, 2019

Finite-Field Arithmetic Cryptography

Conference paper · preferred IACR ePrint Conference paper

Handling Vinegar Variables to Shorten Rainbow Key Pairs

Gustavo Zambonin, Matheus S. P. Bittencourt, Ricardo Felipe Cust\'odio

Progress in Cryptology - AFRICACRYPT 2019 - 11th International Conference on Cryptology in Africa, Rabat, Morocco, July 9-11, 2019, Proceedings, 2019

Post-Quantum Cryptography Cryptography

Conference paper · preferred

2018

Fast modular reduction and squaring in \emphGF(2\(^\mbox\emphm\))

Lucas Boppre Niehues, Ricardo Felipe Cust\'odio, Daniel Panario

Inf. Process. Lett., 2018

Finite-Field Arithmetic Cryptography

Journal article · preferred

Secret Sharing Schemes with Hidden Sets

Rick Lopes de Souza, Mart\'\in Augusto Gagliotti Vigil, Ricardo Felipe Cust\'odio, Florian Caullery, Lucia Moura, Daniel Panario

2018 IEEE Symposium on Computers and Communications, ISCC 2018, Natal, Brazil, June 25-28, 2018, 2018

Cryptography

Conference paper · preferred

Tuning the Winternitz hash-based digital signature scheme

Lucas Pandolfo Perin, Gustavo Zambonin, Douglas Marcelino Beppler Martins, Ricardo Felipe Cust\'odio, Jean Everson Martina

2018 IEEE Symposium on Computers and Communications, ISCC 2018, Natal, Brazil, June 25-28, 2018, 2018

Post-Quantum Cryptography Digital Signatures Cryptography

Conference paper · preferred

2017

Análise de Vulnerabilidade de Esquemas de Segredo Compartilhado Considerando um novo Modelo de Ameaça

Rick Lopes de Souza, Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio

XVII Simpo&\#769;sio Brasileiro de Seguranc&\#807;a da Informac&\#807;a&\#771;o e de Sistemas Computacionais - SBSeg 2017, 2017

Cryptography

Conference paper · preferred

Privacy information in a positive credit system

Marcelo Luiz Brocardo, Carlos Roberto De Rolt, Julio Da Silva Dias, Ricardo Felipe Cust\'odio, Issa Traor\'e

Int. J. Grid Util. Comput., 2017

Privacy & Secure Information Sharing

Journal article · preferred

Privacy-aware web authentication protocol with recovery and revocation

Lucas Boppre Niehues, Ricardo Felipe Custodio

XVII Simpo&\#769;sio Brasileiro de Seguranc&\#807;a da Informac&\#807;a&\#771;o e de Sistemas Computacionais - SBSEG 2017, 2017

Digital Identity

Conference paper · preferred

2016

Formulas for pth root computations in finite fields of characteristic p

PERIN, L.P., Ricardo Felipe Custodio, Daniel Panario, WANG, Q.

Electronics Letters (Online), 2016

Finite-Field Arithmetic Cryptography

Journal article · preferred

2015

An adaptive threat model for security ceremonies

Jean Everson Martina, Eduardo dos Santos, Marcelo Carlomagno Carlos, Geraint Price, Ricardo Felipe Cust\'odio

Int. J. Inf. Sec., 2015

Security Ceremonies

Journal article · preferred

Locating modifications in signed data for partial data integrity

Tha\'\is Bardini Idalino, Lucia Moura, Ricardo Felipe Cust\'odio, Daniel Panario

Inf. Process. Lett., 2015

Digital Signatures Electronic Documents Cryptography

Journal article · preferred arXiv / CoRR

Sharing Privacy Information in Credit Analysis Environment

Marcelo Luiz Brocardo, Ricardo Felipe Cust\'odio, Carlos Roberto De Rolt, Julio Da Silva Dias, Issa Traor\'e

Ninth International Conference on Complex, Intelligent, and Software Intensive Systems, CISIS 2015, Santa Catarina, Brazil, July 8-10, 2015, 2015

Privacy & Secure Information Sharing

Conference paper · preferred

2014

CloudSec - Um Middleware para Compartilhamento de Informações Sigilosas em Nuvens Computacionais

Rick Lopes de Souza, Hylson Vescovi Netto, Lau Cheuk Lung, Ricardo Felipe Custodio

VIV Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2014

Privacy & Secure Information Sharing

Conference paper · preferred

Efficient Data Integrity Checking for Untrusted Database Systems

Anderson Luiz Silverio, Ricardo Felipe Custodio, Marcelo Carlomagno Carlos, Ronaldo dos Santos Mello

The Sixth International Conference on Advances in Databases, Knowledge, and Data Applications, 2014

Privacy & Secure Information Sharing

Conference paper · preferred

SSICC: Sharing Sensitive Information in a Cloud-of-Clouds

Rick Lopes de Souza, Hylson Vescovi Netto, Lau Cheuk Lung, Ricardo Felipe Custodio

ICONS 2014, The Ninth International Conference on Systems, 2014

Privacy & Secure Information Sharing

Conference paper · preferred

2013

A Privacy-Enhanced User-Centric Identity and Access Management Based on Notary

Henri Nogueira, Rick Lopes de Souza, Ricardo Felipe Custodio

The Eighth International Conference on Systems and Networks Communications, 2013

Electronic Documents Public-Key Infrastructure Digital Identity

Conference paper · preferred

A User-Centric Digital Signature Scheme

Felipe Carlos Werlang, Ricardo Felipe Cust\'odio, Mart\'\in Augusto Gagliotti Vigil

Public Key Infrastructures, Services and Applications - 10th European Workshop, EuroPKI 2013, Egham, UK, September 12-13, 2013, Revised Selected Papers, 2013

Digital Signatures Public-Key Infrastructure Cryptography

Conference paper · preferred

An Attribute-Based Public Key Infrastructure

Hendri Nogueira, Ricardo Felipe Custodio, Jean Everson Martina

International Journal of Computer Science and Information Security, 2013

Public-Key Infrastructure Digital Identity Electronic Voting Cryptography

Journal article · preferred

An updated threat model for security ceremonies

Marcelo Carlomagno Carlos, Jean Everson Martina, Geraint Price, Ricardo Felipe Cust\'odio

Proceedings of the 28th Annual ACM Symposium on Applied Computing, SAC '13, Coimbra, Portugal, March 18-22, 2013, 2013

Security Ceremonies

Conference paper · preferred

Digital authentication of medical records: have we found a solution?

Aldo von Wangenheim, Ricardo Felipe Custodio, MARTINA, JEAN EVERSON, GIULIANO, ISABELA DE BACK, Rafael Andrade

Revista da Associação Médica Brasileira, 2013

Electronic Documents Digital Identity

Journal article · preferred

Implementation of Trust Metrics in X.509 Public Key Infrastructure

Lucas Gonçalves Martins, Ricardo Felipe Custodio

The Seventh International Conference on Emerging Security Information, Systems and Technologies, 2013

Public-Key Infrastructure

Conference paper · preferred

Multi-Factor Authentication in Telemedicine Systems

Dayana P. B. Spagnuelo, Jean Everson Martina, Ricardo Felipe Custodio, Rafael Andrade

eTELEMED 2013 : The Fifth International Conference on eHealth, Telemedicine, and Social Medicine, 2013

Digital Identity

Conference paper · preferred

Multi-factor Authentication in Key Management Systems

Rick Lopes de Souza, Lau Cheuk Lung, Ricardo Felipe Cust\'odio

12th IEEE International Conference on Trust, Security and Privacy in Computing and Communications, TrustCom 2013 / 11th IEEE International Symposium on Parallel and Distributed Processing with Applications, ISPA-13 / 12th IEEE International Conference on Ubiquitous Computing and Communications, IUCC-2013, Melbourne, Australia, July 16-18, 2013, 2013

Public-Key Infrastructure Digital Identity

Conference paper · preferred

Sistema Gerenciador de Certificados Digitais: Um modelo para governo eletrônico

Lucas Gonçalves Martins, Ricardo Felipe Custodio

IX Simpósio Brasileiro de Sistemas de Informação, 2013

Public-Key Infrastructure

Conference paper · preferred

\(\mu\)Mobile IPv6 in wireless sensor networks

Ricardo Cust\'odio, Ricardo M. Silva, Jorge S\'a Silva, David Nunes, Fernando Boavida, Carlos Herrera

Seventh International Conference on Sensing Technology, ICST 2013, Wellington, New Zealand, December 3-5, 2013, 2013

Networks, Distributed Systems & Security

Conference paper · preferred

2012

A Proposed Framework for Analysing Security Ceremonies

Marcelo Carlomagno Carlos, Jean Everson Martina, Geraint Price, Ricardo Felipe Cust\'odio

SECRYPT 2012 - Proceedings of the International Conference on Security and Cryptography, Rome, Italy, 24-27 July, 2012, SECRYPT is part of ICETE - The International Joint Conference on e-Business and Telecommunications, 2012

Security Ceremonies Cryptography

Conference paper · preferred

Cleaning up the PKI for Long-term Signatures

Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio

XII SBSeg 2012, 2012

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

The Notary Based PKI - A Lightweight PKI for Long-Term Signatures on Documents

Mart\'\in Augusto Gagliotti Vigil, Cristian Thiago Moecke, Ricardo Felipe Cust\'odio, Melanie Volkamer

Public Key Infrastructures, Services and Applications - 9th European Workshop, EuroPKI 2012, Pisa, Italy, September 13-14, 2012, Revised Selected Papers, 2012

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred Conference paper

Towards a Formal Verification of a Multi-factor Authentication Protocol Using Automated Theorem Provers

Eduardo dos Santos, Jean Everson Martina, Ricardo Felipe Cust\'odio

11th IEEE International Conference on Trust, Security and Privacy in Computing and Communications, TrustCom 2012, Liverpool, United Kingdom, June 25-27, 2012, 2012

Digital Identity Cryptography

Conference paper · preferred

2011

A coordination layer to handle real-time communication in Wi-Fi networks with uncontrolled traffic sources

Robson Costa, Paulo Portugal, Francisco Vasques, Ricardo de Moraes, Ricardo Felipe Cust\'odio

IEEE 36th Conference on Local Computer Networks, LCN 2011, Bonn, Germany, October 4-7, 2011, 2011

Networks, Distributed Systems & Security

Conference paper · preferred

Análise e implementação de um protocolo de gerenciamento de certificados

Anderson Luiz Silverio, KOHLER, J. G, Ricardo Felipe Custodio

WTICG 2011, 2011

Public-Key Infrastructure

Conference paper · preferred

Autenticação digital de documentos médicos: encontramos a solução?

Nobre, Luiz Felipe, von Wangenheim, Aldo, Ricardo Felipe Custodio

RB. Radiologia Brasileira (Impresso), 2011

Electronic Documents Digital Identity

Journal article · preferred

Carimbos do Tempo Autenticados para a Preservação por Longo Prazo de Assinaturas Digitais

Nelson da Silva, Thiago Acórdi Ramos, Ricardo Felipe Custodio

XI SBSEG, 2011

Electronic Documents Digital Signatures Digital Identity Cryptography

Conference paper · preferred

Electronic Documents with Signature Constraints

Felipe Carlos Werlang, Ricardo Felipe Custodio, Roberto Samarone dos Santos Araújo

I WGID, 2011

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Using Notary Based Public Key Infrastructure in Shibboleth

NOGUEIRA, H, Ricardo Felipe Custodio, Cristian Thiago Moecke, Michelle Silva Wangham

I WGID, 2011

Public-Key Infrastructure Electronic Documents

Conference paper · preferred

2010

A Verifiable Voting Protocol Based on Farnel

Roberto Ara\'ujo, Ricardo Felipe Cust\'odio, Jeroen van de Graaf

Towards Trustworthy Elections, New Directions in Electronic Voting, 2010

Electronic Voting Cryptography

Conference paper · preferred IACR ePrint

An Infrastructure for Long-Term Archiving of Authenticated and Sensitive Electronic Documents

Thiago Ac\'ordi Ramos, Nelson da Silva, Lau Cheuk Lung, Jonathan Gehard Kohler, Ricardo Felipe Cust\'odio

Public Key Infrastructures, Services and Applications - 7th European Workshop, EuroPKI 2010, Athens, Greece, September 23-24, 2010. Revised Selected Papers, 2010

Public-Key Infrastructure Electronic Documents

Conference paper · preferred

Analytical Model to Evaluate the Performance of Mobile Agents in a Generic Network Topology

Juliana Amaral Arantes, Carlos Becker Westphall, Ricardo Felipe Cust\'odio, Shirlei Aparecida de Chaves

J. Netw. Syst. Manag., 2010

Networks, Distributed Systems & Security

Journal article · preferred

Assessment of the IEEE 802.11e EDCA Protocol Limitations when Dealing with Real-Time Communication

Ricardo de Moraes, Paulo Portugal, Francisco Vasques, Ricardo Felipe Cust\'odio

EURASIP J. Wirel. Commun. Netw., 2010

Networks, Distributed Systems & Security

Journal article · preferred

Uma ICP baseada em certificados digitais autoassinados

Cristian Thiago Moecke, Ricardo Felipe Custodio, KOHLER, J. G, Marcelo Carlomagno Carlos

X Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2010

Public-Key Infrastructure

Conference paper · preferred

2009

Ceremonies Design for PKI's Hardware Security Modules

Jean Everson Martina, Túlio Salvaro, Ricardo Felipe Custodio

SBSeg 2009, 2009

Public-Key Infrastructure Security Ceremonies

Conference paper · preferred

Ceremonies Formal Analysis in PKI's Context

Jean Everson Martina, T\'ulio Cicero Salvaro de Souza, Ricardo Felipe Cust\'odio

Proceedings of the 12th IEEE International Conference on Computational Science and Engineering, CSE 2009, Vancouver, BC, Canada, August 29-31, 2009, 2009

Public-Key Infrastructure Security Ceremonies

Conference paper · preferred

Distributed DBP: A (m, k)-firm based Distributed Approach for QoS Provision in IEEE 802.15.4 Networks

Tiago Semprebom, Carlos Montez, Ricardo de Moraes, Francisco Vasques, Ricardo Felipe Cust\'odio

Proceedings of 12th IEEE International Conference on Emerging Technologies and Factory Automation, ETFA 2009, September 22-25, 2008, Palma de Mallorca, Spain, 2009

Networks, Distributed Systems & Security

Conference paper · preferred

Infra-estrutura de Chaves Públicas Otimizada: Uma ICP de Suporte a Assinaturas Eficientes para Documentos Eletrônicos

Martín Augusto Gagliotti Vigil, Ricardo Felipe Custodio, Ricardo Alexandre Reinaldo de Moraes

IX Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais, 2009

Electronic Documents Public-Key Infrastructure Digital Signatures Cryptography

Conference paper · preferred

Propostas para apoiar a preservação documental de longo prazo na ICP-Brasil

Rafael Timóteeo de Souza Jr., Ricardo Felipe Custodio, Viviane Bertol

CIBSI 2009 - V Congreso Iberoamericano de Seguridad Informática, 2009

Public-Key Infrastructure Electronic Documents

Conference paper · preferred

2008

Audit and backup procedures for hardware security modules

T\'ulio Cicero Salvaro de Souza, Jean Everson Martina, Ricardo Felipe Cust\'odio

IDtrust 2008, Proceedings of the 7th Symposium on Identity and Trust on the Internet, March 4-6, 2008, Gaithersburg, Maryland, USA, 2008

Digital Identity

Conference paper · preferred

Good practices for Long-Term Key Management in a Public Key Infrastructure

Marcelo Carlomagno Carlos, Ricardo Felipe Custodio, Jeandré Monteiro Sutil

CSEWORKSHOPS '08: Proceedings of the 2008 11th IEEE International Conference on Computational Science and Engineering - Workshops, 2008

Public-Key Infrastructure

Conference paper · preferred

Optimized Certificates - A New Proposal for Efficient Electronic Document Signature Validation

Ricardo Felipe Cust\'odio, Mart\'\in Augusto Gagliotti Vigil, Juliano Romani, Fernando Carlos Pereira, Joni da Silva Fraga

Public Key Infrastructure, 5th European PKI Workshop: Theory and Practice, EuroPKI 2008, Trondheim, Norway, June 16-17, 2008, Proceedings, 2008

Public-Key Infrastructure Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Self-Adaptable and Intrusion Tolerant Certificate Authority for Mobile Ad Hoc Networks

Fernando Carlos Pereira, Joni da Silva Fraga, Ricardo Felipe Cust\'odio

22nd International Conference on Advanced Information Networking and Applications, AINA 2008, GinoWan, Okinawa, Japan, March 25-28, 2008, 2008

Public-Key Infrastructure

Conference paper · preferred

2007

Autoridade Certificadora Dinâmica para Redes Ad Hoc Móveis

Fernando Carlos Pereira, Joni da Silva Fraga, Adriana Elissa Notoya, Ricardo Felipe Custodio

25o. Simpósio Brasileiro de Redes de Computadores e Sistemas Distribuídos (SBRC), 2007

Public-Key Infrastructure

Conference paper · preferred

Central Notarial de Serviços Eletrônicos Compartilhados

Nelson da Silva, Ricardo Felipe Custodio, Ricardo Pereira e Silva, Thiago Acórdi Ramos

Yendis, 2007

Electronic Documents Public-Key Infrastructure

Book · preferred

Certificados Otimizados para a validação eficiente da Assinatura Digital

Adriana Elissa Notoya, Ricardo Felipe Custodio, Fernando Carlos Pereira, Joni da Silva Fraga

VII Certificados Otimizados para a validação eficiente da Assinatura Digital, 2007

Public-Key Infrastructure Digital Signatures Cryptography

Conference paper · preferred

OpenHSM: An Open Key Life Cycle Protocol for Public Key Infrastructure's Hardware Security Modules

Jean Everson Martina, T\'ulio Cicero Salvaro de Souza, Ricardo Felipe Cust\'odio

Public Key Infrastructure, 4th European PKI Workshop: Theory and Practice, EuroPKI 2007, Palma de Mallorca, Spain, June 28-30, 2007, Proceedings, 2007

Public-Key Infrastructure Cryptography

Conference paper · preferred

Temporal Key Release Infrastructure

Ricardo Felipe Custodio, Júlio da Silva Dias, Fernando Carlos Pereira, Adriana Elissa Notoya

6th Annual PKI R&D Workshop, 2007

Public-Key Infrastructure

Conference paper · preferred

2006

An Electronic Scheme for the Farnel Paper-Based Voting Protocol

Roberto Samarone dos Santos Araújo, Ricardo Felipe Custodio, A. Wiesmaier, T. Takagi

4th International Conference on Applied Cryptography and Network Security (ACNS'06), 2006

Electronic Voting Cryptography

Conference paper · preferred

Tornando uma infra-estrutura de chaves publicas dinâmica

Marcelo Carlomagno Carlos, Ricardo Felipe Custodio

SSI 2006, 2006

Public-Key Infrastructure

Conference paper · preferred

2004

Denúncia Anônima Segura

Fernando Cézar de Oliveira Lopes, Ricardo Felipe Custodio

Revista do IST, 2004

Privacy & Secure Information Sharing Cryptography

Journal article · preferred

Execução Segura de Assinaturas Confiáveis em Documentos Eletrônicos

Júlio da Silva Dias, Jean Everson Martina, Ricardo Felipe Custodio, Daniel Santana de Freitas

SBRC 2004, 2004

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Infra-estrutura de Chaves Públicas e Aplicações

Ricardo Felipe Custodio, Adriana Elissa Notoya, Fernando Carlos Pereira

XII Escola Regional de Informática da SBC, 2004

Public-Key Infrastructure

Book chapter · preferred

Módulo Cifrador de Documentos Eletrônicos

Ricardo Felipe Custodio, Júlio da Silva Dias, Fernando Carlos Pereira, Adriana Elissa Notoya

WSeg 2004 - IV Workshop em Segurança de Sistemas Computacionais, 2004

Electronic Documents

Conference paper · preferred

Uma infra-estrutura para o sigilo temporal de documentos eletrônicos

Ricardo Felipe Custodio, Júlio da Silva Dias, Fernando Carlos Pereira, Adriana Elissa Notoya

Scientia (UNISINOS), 2004

Electronic Documents

Journal article · preferred

2003

Assinatura Confiável de Documentos Eletrônicos

Júlio da Silva Dias, Ricardo Felipe Custodio, Carlos Roberto de Rolt

WSeg-2003, 2003

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Client/Server and Mobile Agent Paradigms - An Analytical Model for Performance Evaluation

Juliana Amaral Arantes, Carlos Becker Westphall, Ricardo Felipe Custodio

Colloque Francophone sur la Gestion de Réseuax et Service, 2003, Fortaleza (CE), 2003

Networks, Distributed Systems & Security

Conference paper · preferred

Confiança na Tempestividade dos Documentos Eletrônicos: Auditoria da Protocolação Digital

Vanessa Costa, Ricardo Felipe Custodio, Júlio da Silva Dias, Carlos Roberto de Rolt

Anais Eletrônicos do SSI'2003, 2003

Electronic Documents

Conference paper · preferred

Ostracon: Um Sistema de Votação Digital pela Internet

Fabiano Castro Pereira, Ricardo Felipe Custodio

SBRC-2003, WSeg-2003, 2003

Electronic Voting Cryptography

Conference paper · preferred

Protocolação Digital de Documentos Eletrônicos

Vanessa Costa, Ricardo Felipe Custodio, Júlio da Silva Dias, Carlos Roberto de Rolt

I Fórum sobre Segurança, Privacidade e Certificação Digital, 2003

Electronic Documents Public-Key Infrastructure

Conference paper · preferred

Protocolo Criptográfico para Envio de Propostas em Processos de Compras

Fernando Carlos Pereira, Ricardo Felipe Custodio, Adriana Elissa Notoya

Anais do V SSI 2003, 2003

Cryptography

Conference paper · preferred

Reliable Clock Synchronization for Eletronic Documents

J\'ulio S. Dias, Denise B. Dem\'etrio, Ricardo Felipe Cust\'odio, Carlos Roberto De Rolt

3rd Latin American Network Operations and Management Symposium, LANOMS 2003, Iguassu Falls, Brazil, September 4-6, 2003. Proceedings, 2003

Electronic Documents

Conference paper · preferred

Sincronização Segura de Relógio para Documentos Eletrônicos

Júlio da Silva Dias, Ricardo Felipe Custodio, Denise Bendo Demétrio

SBRC 2003, 2003

Electronic Documents

Conference paper · preferred

Sistema Seguro para Assinatura de Documentos Eletrônicos

Júlio da Silva Dias, Ricardo Felipe Custodio, Carlos Roberto de Rolt

Anais do IADIS WWW/internet 2003, 2003

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

2002

A New Method for Digital Time-Stamping of Electronic Documents

Everton Schonardie Pasqual, Júlio da Silva Dias, Ricardo Felipe Custodio

14th Anual FIRST Conference on Computer Security Incident Handling & Response 2002, 2002

Electronic Documents

Conference paper · preferred

Assinatura Digital de Documentos Eletrônicos através da Impressão Digital

Juliano Fontoura Kazienko, Felipe Pompeo Pereira, Ricardo Felipe Custodio

XII Seminário Regional de Informática, 2002

Electronic Documents Digital Signatures Cryptography

Conference paper · preferred

Farnel: Um protocolo Criptográficos para Votação Digital

Ricardo Felipe Custodio, Roberto Samarone dos Santos Araújo, Augusto Jun Devegili

WSeg 2002, 2002

Electronic Voting Cryptography

Conference paper · preferred

IARSDE: Infra-estrutura de Armazenamento e Recuperação Segura de Documentos Eletrônicos

Adriana Elissa Notoya, Ricardo Felipe Custodio

The International Symposium on Document Technologies, 2002

Electronic Documents

Conference paper · preferred

Modelo Analítico para Avaliar Plataformas Cliente/Servidor e Agentes Móveis Aplicados à Gerência de Redes

Juliana Amaral Arantes, Carlos Becker Westphall, Ricardo Felipe Custodio

SBRC 2002, 2002

Networks, Distributed Systems & Security

Conference paper · preferred

Tecnologias para a Segurança da Informação: Infra-estrutura de Chaves Públicas

Ricardo Felipe Custodio

EIN/Ecoinfo 2002, 2002

Public-Key Infrastructure

Conference paper · preferred

Um Protocolo Criptográfico para Comunicação Anônima Segura

Paulo Sérgio Ribeiro, Ricardo Felipe Custodio

WSeg 2002, 2002

Cryptography Privacy & Secure Information Sharing

Conference paper · preferred

Uma Proposta Para Garantia da Validade do Documento Eletronico por Tempo Indeterminado

Adriana Elissa Notoya, Ricardo Felipe Custodio

SSI´2002 - IV Simposio Seguranca em Informatica, 2002

Electronic Documents

Conference paper · preferred

2001

Aspectos Tecnológicos para a Validade Jurídica da Cópia Impressa&\#10;de um Documento Eletrônico

Adriana Elissa Notoya, Ricardo Felipe Custodio

SEMINC 2001, 2001

Electronic Documents

Conference paper · preferred

Cartório Virtual: uma experiência na emissão de certidão de nascimento.

Aires José Rover, Ricardo Felipe Custodio, Dejane Luiza Bortoli

Revista do Curso de Direito das Faculdades Jorge Amado, 2001

Electronic Documents

Journal article · preferred

Fundamentos de Criptografia

Luiz Carlos Zancanella, Ricardo Felipe Custodio, Daniel Santa Freitas

IX Escola de Informática da SBC-Sul, 2001

Cryptography

Conference paper · preferred

Infra-estrutura de chaves públicas

Ricardo Felipe Custodio

3o. Simpósio de Segurança em Informação, 2001

Public-Key Infrastructure

Conference paper · preferred

Proteção de Software por Certificação Digital

João Luiz Francalacci Rocha, Ricardo Felipe Custodio

SSI 2001, 2001

Public-Key Infrastructure

Conference paper · preferred

Um Novo Método para Datação de Documentos Eletrônicos

Everton Schonardie Pasqual, Júlio da Silva Dias, Ricardo Felipe Custodio

SEMINC 2001, 2001

Electronic Documents

Conference paper · preferred

2000

Avaliação Analítica de Desempenho do Uso do Ipv6

Maurílio Alves Martins da Costa, Ricardo Felipe Custodio, Carlos Becker Westphall

I Workshop da Pós-Graduação em Ciência da Computação, 2000

Networks, Distributed Systems & Security

Conference paper · preferred

Use of Lyapunov Exponents for Pattern Recognition in Lung Sounds

Luiz Paulo Luna de Oliveira, Ricardo Felipe Custodio, Waldir Leite Roque

Proceedings of VIII Workshop on Nonlinear Dynamics of Eletronic Systems, 2000

Biomedical Signal Analysis

Conference paper · preferred

1999

An\'alise n\~ao-linear no reconhecimento de padr\~oes sonoros : estudo de caso para sons pulmonares

Ricardo Felipe Cust\'odio

1999

Biomedical Signal Analysis

PhD thesis · preferred

Análise de Sons Pulmonares via Dinâmica Caótica

Waldir Leite Roque, Luiz Paulo Luna de Oliveira, Ricardo Felipe Custodio

I Jornada de Pneumologia do Mercosul, 1999

Biomedical Signal Analysis

Conference paper · preferred

Identifying Lung Sound Patterns through Lyapunov Exponent Estimations

Waldir Leite Roque, Luiz Paulo Luna de Oliveira, Ricardo Felipe Custodio

Congresso Nacional de Matematica Aplicada e Computacional, 1999

Biomedical Signal Analysis

Conference paper · preferred

Lung Sound Analysis with Time-Dependent Fractal Dimensions

Luiz Paulo Luna de Oliveira, Waldir Leite Roque, Ricardo Felipe Custodio

Chaos, Solitons and Fractals, 1999

Biomedical Signal Analysis

Journal article · preferred

Negative Lyapunov Exponent Estimations in Non Chaotic Data Time Series

Luiz Paulo Luna de Oliveira, Ricardo Felipe Custodio, Waldir Leite Roque

NDES99 - Nonlinear Dynamics of Electronic Systems, 1999

Biomedical Signal Analysis

Conference paper · preferred

PulSA: A System to Support Lung Sound Analysis

Waldir Leite Roque, T. Heimfarth, T. Spengler, H. Valliatti, Ricardo Felipe Custodio, Luiz Paulo Luna de Oliveira

The 23rf International Conference on Lung Sounds, 1999

Biomedical Signal Analysis

Conference paper · preferred

1998

Time-Dependent Fractal Dimension of Lung Sounds

Waldir Leite Roque, Luiz Paulo Luna de Oliveira, Ricardo Felipe Custodio, H. Valliatti

International Conference on Lung Sounds, 1998

Biomedical Signal Analysis

Conference paper · preferred

1997

Atomic Decomposition with Genetic Algorithms

Ricardo Felipe Custodio, Dante Augusto Couto Barone

1997 International Symposium on Nonlinear Theory and its Applications, 1997

Computational Intelligence

Conference paper · preferred

1996

A Computação Algébrica no Ensino

Sérgio Peters, Ricardo Felipe Custodio, Rita Eger, Nelcy Mendonça

XIX Congresso Nacional de Matematica Aplicada e Computacional, 1996

Scientific Computing & Instrumentation

Conference paper · preferred

1994

Metodo da Iteraçao Dinâmica para a Determinaçãoo de Zeros de Funções

Ricardo Felipe Custodio, Milton P. de Borba

XVII Congresso Nacional de Matematica Aplicada e Computacional, 1994

Scientific Computing & Instrumentation

Conference paper · preferred

Poligraph as a Virtual Instrumentation

Julíbio David Ardigo, Carlos Ignácio Zanchin, Walter Celso de Lima, Ricardo Felipe Custodio

Physics in Medicine & Biology, 1994

Scientific Computing & Instrumentation

Conference paper · preferred

1993

A proposal for Efficient Neural Network Data Structuring

Ricardo Felipe Custodio, Francisco Olegário Muller Neto, Walter Celso de Lima

Ninth International Conference on Systems Engineering, 1993

AI & Security

Conference paper · preferred

Estructuración Eficiente de los Datos de las Redes de Neuronas Artificiales

Ricardo Felipe Custodio, J. P. Oliveira, O. R. Garcia, Walter Celso de Lima

X Congresso Chileno de Engenharia Elétrica, 1993

Computational Intelligence

Conference paper · preferred

Redes Neurais Artificiais para Representação de Conhecimento Médico em Anestesiologia

Jurandir Paz Oliveira, Renato Garcia Ojeda, Ricardo Felipe Custodio, Walter Celso de Lima

X Congresso Chileno de Engenharia Elétrica, 1993

Computational Intelligence

Conference paper · preferred

Regula - Um CAD para o projeto de Fontes de Alimentação com Reguladores Integrados

Francisco Olegário Müller Neto, Ricardo Felipe Custodio, Carlos Ignácio Zanchin, João da Silva Dias

X Congresso Chileno de Engenharia Elétrica, 1993

Scientific Computing & Instrumentation

Conference paper · preferred

Sistema Optoeletrônico de Medição de Posição por Triangulação

João da Silva Dias, Ricardo Felipe Custodio, Carlos Ignácio Zanchin, Fernando Passold

X Congresso Chileno de Engenharia Elétrica, 1993

Scientific Computing & Instrumentation

Conference paper · preferred

1989

Prototipação de Sistemas a Partir da Definição da Interface Homem Máquina

Marcos Wilson Costa de Aguiar, Ricardo Felipe Custodio, Roque Volkmer

V Reunião de Trabalho do Projeto ESTRA - Estação de Trabalho Avançada, 1989

Scientific Computing & Instrumentation

Conference paper · preferred