Benjamin Beurdouche

@beurdouche

Researcher . Almost gone from and :( Formal verification for cryptography and security protocols (MLS, TLS, HACL*…)

Vrijeme pridruživanja: listopad 2011.

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  1. 3. velj

    Today is my first day at ! 🥳 I am very excited to work within such an amazing company and I’ll do my best to protect the internet ! ;) I’ll miss !!

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  2. proslijedio/la je Tweet
    31. sij

    My student Denis wrote a formal semantics for the French tax code, complete with Coq proof of soundness and SMT queries to uncover unfair tax hikes. PL for fiscal justice!

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    30. sij

    Coq 8.11.0 has been released! It introduces Ltac2 tactic language and primitive IEEE 754 floats. A summary and packages for Windows & macOS are available at . An opam release is underway. Many thanks to the Coq team and the release manager P.-M. Pédrot!

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    29. sij

    Relieved to see that Italians can finally resort to non-verbal communication on Twitter with this new emoji from the 2020 emoji list:

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  5. 30. sij

    The IETF Messaging Layer Security (MLS) working group released an update of the Architecture document.

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    29. sij

    Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu

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    28. sij

    Excited to share this blog post about some of the work and I have been doing at the , designing a new network stack for Zcash:

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    Black holes are a good metaphor for “enclaves” sharing caches with the main CPU. In principle, they should not leak data (Hawking says black holes destroy information) but in practice they end up leaking through a side channel (the gravitons)

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  9. 26. sij

    Axiom: debating formal notions with informal terminology on Twitter ends up with everyone confused! 🙃

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    24. sij

    For all your cryptographic needs (ahem, e.g., HACL*) use a formally verified, constant time-preserving C compiler! at

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  11. 24. sij

    This is how an IETF Messaging Layer Security (MLS) secure group messaging session evolves over time… Our CGKA is called TreeKEM and most of the time requires O(log N) encryptions / O(1) decryption for changes in active groups.

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    How robust is your model against adversarial attacks? We recently released Advbox, a toolbox to generate adversarial examples that fool neural networks across DL frameworks and benchmark the robustness of ML models. ArXiv: GitHub:

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    23. sij

    Google and Mozilla sent Microsoft cakes to celebrate its Edge Chromium release. The cake tradition continues 🎂

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    23. sij

    Anonymous Tokens with Private Metadata Bit: B Kreuter, T Lepoint, M Orru, M Raykova

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  15. 22. sij

    OMG! IETF Messaging Layer Security ! :)

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    22. sij

    Coming soon to OpenSSL: a simple, safe and performant API for primality testing. With , and with thanks to Kurt Roeckx from OpenSSL and who posed the question.

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  17. 17. sij

    I claim Messaging Layer Security (MLS) is actually a group-private blockchain! You know we have a chaining of Merkle trees updated via commits !! 🥳

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    9. sij

    "None of the software guarantees that you expected hold. Invisible bugs, that you can't see, everywhere." 😭

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    One thing that the Messaging Layer Security working group has shown is that N cryptographers working together can be as good or better than 2 cryptographers (for N>2). You end up with a lot more complexity, but working through that complexity reveals new and powerful insights.

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  20. 14. sij

    It is so confusing to see people keep debating about doing pen and paper cryptographic proofs of some small constructs when their protocol is completely broken symbolically :/ **The primitives serve no purpose if your protocol is broken !!!**

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