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718 résultats

• • Séminaire

  • Cryptographie

  Generic SCARE: reverse engineering without knowing the algorithm nor the machine

  • 12 avril 2024

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

  Orateur : Hélène LE BOUDER - IMT Atlantique

  A novel side-channel-based reverse engineering technique is introduced, capable of reconstructing a procedure solely from inputs, outputs, and traces of execution. Beyond generic restrictions, no prior knowledge of the procedure or the chip it operates on is assumed. These restrictions confine the analysis to 8-bit RISC constant-time software implementations. Specifically, the feasibility of[…]

• • Séminaire

  • Cryptographie

  Finding short integer solutions when the modulus is small

  • 24 novembre 2023

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

  Orateur : Eamonn Postlethwaite - King's College London

  We present cryptanalysis of the inhomogenous short integer solution (ISIS) problem for anomalously small moduli by exploiting the geometry of BKZ reduced bases of q-ary lattices. We apply this cryptanalysis to examples from the literature where taking such small moduli has been suggested. A recent work [Espitau–Tibouchi–Wallet–Yu, CRYPTO 2022] suggests small versions of the lattice signature[…]

• • Séminaire

  • Cryptographie

  Quantum Linear Key-recovery Attacks Using the QFT

  • 09 février 2024

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

  Orateur : André Schrottenloher - IRISA

  The Quantum Fourier Transform is a fundamental tool in quantum cryptanalysis, not only as the building block of Shor's algorithm, but also in attacks against symmetric cryptosystems. Indeed, hidden shift algorithms such as Simon's (FOCS 1994), which rely on the QFT, have been used to obtain attacks on some very specific block cipher structures. The Fourier Transform is also used in classical[…]

• • Séminaire

  • Cryptographie

  TBD (To be decided closer to the date of the talk)

  • 05 avril 2024

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

  Orateur : Lisa Kohl - CWI

  TBD (To be decided closer to the date of the talk)

• • Groupe de travail

  Modélisation statistique et sécurité des générateurs d'aléa pour la cryptographie

  • 08 avril 2023 (11:00 - 12:00)

  • À l'IRISA, campus de Beaulieu, Rennes

  Orateur : David Lubicz - DGA, IRMAR

  Dans cet exposé on essaie d'expliquer ce que l'on entend pas méthodes statistiques et on donne des exemples concrets d'application dans la cybersécurité.

  • Cryptography

• • Groupe de travail

  Analyse statistique des extrêmes pour la modélisation d'évènements rares ou atypiques

  • 08 avril 2023 (10:00 - 11:00)

  • À l'IRISA, campus de Beaulieu, Rennes

  Orateur : Gilles Stupfler - ENSAI