cryptography, information security, digital trust, digital signatures, public-key infrastructure, electronic identity, electronic documents, post-quantum cryptography, finite fields, artificial intelligence security
Ricardo Custódio
Professor · Researcher · Advisor
I work on the foundations and infrastructures of digital trust: cryptography, digital signatures, electronic documents, public-key infrastructure, electronic identity, post-quantum security, finite-field arithmetic, and security for artificial-intelligence agents.
My research connects mathematical foundations with architectures, technological artifacts, and real-world trust ecosystems.
ORCID · Lattes · Google Scholar · GitHub · LinkedIn
Research
My research asks a broad question: how can computation be made trustworthy?
This question has guided work on cryptographic mechanisms, secure electronic documents, digital signatures and PKI, electronic identity, post-quantum transition, and, more recently, identity and authorization for AI agents.
Cryptography & Finite Fields
Cryptographic protocols, implementation foundations, binary extension fields, irreducible polynomials, and efficient arithmetic.
Digital Signatures & PKI
Digital signatures, certificates, trust infrastructures, hardware security modules, signature policies, and long-term verification.
Identity & Electronic Documents
Electronic identity, credentials, authentication, authorization, document authenticity, confidentiality, provenance, and preservation.
Post-Quantum Security
Migration of certificates, protocols, identity systems, signatures, and long-lived electronic evidence to post-quantum cryptography.
AI, Agents & Digital Trust
Identity, delegation, authorization, accountability, and auditability for autonomous and semi-autonomous AI agents.
Explore the Academic Record
The site is organized as a set of connected academic collections rather than as a single curriculum vitae.
Publications
Scholarly publications, selected works, and research areas.
Projects
Research projects and technological development across different periods.
Supervision
Master’s and doctoral research and the academic genealogy around LabSEC.
Software & Data
Research software, prototypes, reference implementations, and technological artifacts.
Books & Texts
Books, technical texts, reports, and longer-form academic material.
Teaching
Courses, teaching trajectory, and selected educational resources.
Talks
Selected talks, presentations, workshops, and historical speaking record.
Academic Archive
A historical view connecting research themes, projects, publications, software, students, texts, and talks.
From Engineering to Digital Trust
My academic trajectory began in electrical engineering and industrial automation, moved through scientific computing and cryptography, and developed into a long-term research program on computer security and digital trust.
Since 2000, much of this work has been developed through the Laboratory for Computer Security (LabSEC) at the Federal University of Santa Catarina, combining research, student supervision, and technological development.
An Academic Memory, Not Only a Website
This site is designed as a long-term scholarly record. Publications are only one part of that record. Projects, software, technical texts, courses, talks, supervision, and unfinished research directions also document how ideas develop over time.
The Academic Archive connects these records into historical periods and research genealogies.