Séminaire Cryptographie

Infos pratiques

• Date

  Le séminaire de cryptographie de Rennes se déroule le vendredi à 13h45. Les participants peuvent suggérer un invité ou un sujet d'exposé en envoyant un email à un membre du comité scientifique.
• Emplacement

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

• Predicting Module-Lattice Reduction

  • 19 décembre 2025 (13:45 - 14:45)

  • Batiment 22-23 salle 16 (en face de l'amphi Lebesgue)

  Orateur : Paola de Perthuis - CWI

  Is module-lattice reduction better than unstructured lattice reduction? This question was highlighted as `Q8' in the Kyber NIST standardization submission (Avanzi et al., 2021), as potentially affecting the concrete security of Kyber and other module-lattice-based schemes. Foundational works on module-lattice reduction (Lee, Pellet-Mary, Stehlé, and Wallet, ASIACRYPT 2019; Mukherjee and Stephens[…]

  • Cryptography

• Séminaire C2 à INRIA Paris

  • 16 janvier 2026 (10:00 - 17:00)

  • INRIA Paris

  Emmanuel Thomé et Pierrick Gaudry Rachelle Heim Boissier Épiphane Nouetowa Dung Bui Plus d'infos sur https://seminaire-c2.inria.fr/ 

• Attacking the Supersingular Isogeny Problem: From the Delfs–Galbraith algorithm to oriented graphs

  • 23 janvier 2026 (13:45 - 14:45)

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

  Orateur : Arthur Herlédan Le Merdy - COSIC, KU Leuven

  The threat of quantum computers motivates the introduction of new hard problems for cryptography.One promising candidate is the Isogeny problem: given two elliptic curves, compute a “nice’’ map between them, called an isogeny.In this talk, we study classical attacks on this problem, specialised to supersingular elliptic curves, on which the security of current isogeny-based cryptography relies. In[…]

  • Cryptography

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Presentation du séminaire

• About cryptography

  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. 

• The seminar leaders

  Leader :

  • Sylvain Duquesne ( University of Rennes) (leader) 

  Board :

  • Gwezenheg Robert (DGA)
  • André Schrottenloher (INRIA)  

• The scientific committee

  • Philippe Chartier (IRMAR)
  • Clément Dell'aiera (DGA-MI & IRISA)
  • Sylvain Duquesne (IRMAR)
  • Antonin Leroux (DGA-MI & IRMAR)
  • Pierre Loidreau (DGA-MI & IRMAR)
  • David Lubicz (DGA-MI & IRMAR)
  • Jade Nardi (IRMAR)
  • Gwezenheg Robert (DGA-MI & IRMAR)
  • André Schrottenloher (IRISA)
  • YiXin Shen (IRISA)
  • Arnaud Tisserand 

• The organizations involved

  • 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.