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Friday, February 19 • 3:30pm - 3:55pm
Making heads or tails of TLS certificate errors

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The ecosystem of TLS certificates is rather complicated. Just OpenSSL has over 75 different possible errors only related to certificate validation, some of them somewhat cryptic. Furthermore, other libraries have incompatible error sets, complicating knowledge transfer.
Usable X.509 Errors (https://x509errors.org) is a project attempting to improve the situation. It compares errors from commonly used libraries (OpenSSL, GnuTLS, Botan, mbedTLS), consolidating the corresponding documentation from all those libraries in a single place. It tries to explain what the validation errors mean by devising better documentation and providing ready-to-use sample certificates for testing.
The presented research is a part of the academic cooperation of Red Hat Czech and Masaryk University.

avatar for Martin Ukrop

Martin Ukrop

researcher, teacher, Masaryk University
Passionate about usable security, user experience, teaching and experiential learning. Actively organizing educational events in the community "Instruktoři Brno". Ceaselessly fascinated by the world.
avatar for Pavol Žáčik

Pavol Žáčik

Student, Masaryk University
Student, begginer security researcher at CRoCS - Masaryk University.

Friday February 19, 2021 3:30pm - 3:55pm CET
Session Room 6