Defensive cybersecurity · open education · governed AI research
I have worked in cybersecurity since 2007. I build defensive tools, study how AI systems can operate within verifiable limits, and publish free learning material for people who want to protect systems and the people who depend on them.
OpenCyber Academy is a free, public cybersecurity learning library. You can study without creating an account. Choose a subject or a formation level, then follow a course's guide, lessons, examples, exercises and worked answers.
Open the academy · Browse by subject · Browse by level · Read the source on GitHub
Start with a published chapter: English — Cybersecurity foundations · Português — Segurança da informação · Español — Seguridad de la información
Each published chapter leads to teaching, a worked example, exercises and answers. For the full route, follow the study path; for a short introduction to send someone, use Share a lesson. The book standard explains how published teaching is reviewed and how it differs from a course plan.
Confronto Cibernético examines the response to advanced persistent threats (APTs). It connects incident investigation, digital forensics, containment and tactical intelligence, and introduces a coordinated defensive “black team” approach. Explore the book and its editions.
- DAI — Decripte Artificial Intelligence: research on a cybersecurity language model with authority separated from model output, independent verification and reviewable evidence. Research paper.
- ADAI — Autonomous Defensive Artificial Intelligence: a proposed framework for bounded defensive autonomy and evidence-based decisions in production environments. Research paper.
These are research projects with their own assumptions and limitations, separate from the academy's course books.
Selected public work includes incident-response playbooks, AI security guardrails and cloud posture assessment. See the full project index for more tools and references.
My work favors authorized defensive use, reproducible evidence, clear limitations and source attribution. Original OpenCyber Academy teaching is shared under CC0 1.0 where the rights statement applies; linked sources and other projects keep their own terms.