Table of contents

The cryptography seminar is systematically visible by videoconference.

Practical infos

  • Date

    The cryptography seminar of Rennes takes place every Friday at 1:45 p.m. Any participant can suggest a guest or a talk subject by using the form below..

  • Location

    IRMAR - Université de Rennes - Campus Beaulieu Bat. 22, RDC, Rennes Amphi Lebesgue
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Next sessions

  • Algorithms for post-quantum commutative group actions

    • March 27, 2026 (13:45 - 14:45)

    • IRMAR - Université de Rennes - Campus Beaulieu Bat. 22, RDC, Rennes - Amphi Lebesgue

    Speaker : Marc Houben - Inria Bordeaux

    At the historical foundation of isogeny-based cryptography lies a scheme known as CRS; a key exchange protocol based on class group actions on elliptic curves. Along with more efficient variants, such as CSIDH, this framework has emerged as a powerful building block for the construction of advanced post-quantum cryptographic primitives. Unfortunately, all protocols in this line of work are[…]

  • Journées C2: pas de séminaire

    • April 03, 2026 (13:45 - 14:45)

    • IRMAR - Université de Rennes - Campus Beaulieu Bat. 22, RDC, Rennes - Amphi Lebesgue

  • Endomorphisms via Splittings

    • April 10, 2026 (13:45 - 14:45)

    • IRMAR - Université de Rennes - Campus Beaulieu Bat. 22, RDC, Rennes - Amphi Lebesgue

    Speaker : Min-Yi Shen - No Affiliation

    One of the fundamental hardness assumptions underlying isogeny-based cryptography is the problem of finding a non-trivial endomorphism of a given supersingular elliptic curve. In this talk, we show that the problem is related to the problem of finding a splitting of a principally polarised superspecial abelian surface. In particular, we provide formal security reductions and a proof-of-concept[…]

    • Cryptography

Previous session

Lightweight (AND, XOR) Implementations of Large-Degree S-boxes

  • March 20, 2026 (13:45 - 14:45)

  • IRMAR - Université de Rennes - Campus Beaulieu Bat. 22, RDC, Rennes - Amphi Lebesgue

Speaker : Marie Bolzer - LORIA

The problem of finding a minimal circuit to implement a given function is one of the oldest in electronics. In cryptography, the focus is on small functions, especially on S-boxes which are classically the only non-linear functions in iterated block ciphers. In this work, we propose new ad-hoc automatic tools to look for lightweight implementations of non-linear functions on up to 5 variables for[…]

  • Cryptography

  • Symmetrical primitive

  • Implementation of cryptographic algorithm

Show previous sessions

Subscribe to the mailing list

A mailing list is available for announcements concerning Cryptography seminar's talks. To subscribe, you just have to send an email to sympa@listes.univ-rennes1.fr with subscribe math-crypto as a subject.

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Presentation of the seminar

  • Scientists welcome the renewed interest and original insight that cryptography brings to their disciplines, as well as the intellectual challenges posed to them.

    Multidisciplinary par excellence, cryptography constitutes a point of contact between number theory, algebraic geometry, algorithms and computer science. It brings whole sections of the most fundamental mathematics into contact with applications of great practical importance. 

  • Leader :

    Board :

    • The General Directorate of Armament (DGA) : state body responsible for the development of cryptographic algorithms, which depends on the the Ministry of the Armed Forces.
    • Rennes Mathematical Research Institute (IRMAR) : mathematics research laboratory associating the National Center for Scientific Research (CNRS), the University of Rennes, the École Normale Supérieure de Cachan (ENS Cachan), the National Institute of Applied Sciences of Rennes (INSA Rennes) and the University of Rennes 2.
    • Institute for Research in Computer Science and Random Systems (IRISA): computer science research laboratory in Rennes.

    DGA, IRISA and IRMAR wish, by organizing this cooperative seminar, to crystallize the interest of different actors in the Rennes region around cryptography and, beyond current fashion, to encourage fruitful and scientific collaboration. quality.

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