Current

The seminar is held on Tuesdays from 11 to 12 and is organised by Sabrina Kunzweiler and Maxime Bombar. Unless stated otherwise it takes place in room 2 of IMB. To get announcements, you can subscribe to the mailing list of the Bordeaux number theory seminars. Last minute changes may appear first on the IMB website.

• 2025-09-23
  11:00
  Salle 2
  Clémence Bouvier (CARAMBA, INRIA Nancy)
  Exponential sums and Linear cryptanalysis: Analysis of Butterfly-like constructions
  This presentation focuses on the recently identified links between algebraic geometry and symmetric cryptography. Specifically, we demonstrate how bounds on exponential sums, based on results from Deligne, Denef–Loeser and Rojas–León, can be used to evaluate the correlations of linear approximations in cryptographic constructions with a low algebraic degree. This yields concrete bounds for Butterfly-like designs, such as the Flystel. These results reinforce security arguments against linear cryptanalysis, notably by resolving a conjecture on the Flystel construction.
• 2025-09-30
  11:00
  Salle 2
  Wessel van Woerden (PQShield)
  TBA
• 2025-10-07
  11:00
  Salle 2
  Raymond van Bommel (University of Bristol)
  TBA