690 results

  • Cryptanalysis of full BEANIE

    • June 05, 2026 (13:45 - 14:45)

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

    Speaker : Xavier Bonnetain - Inria

    BEANIE is a tweakable block cipher recently published at ToSC aiming for memory encryption of microcontroller units. In line with this goal, it handles small plaintexts of only 32 bits and has a low latency. In this paper, we propose the first third-party analysis of the two variants of BEANIE. By carefully leveraging structural properties of the cipher and taking advantage of its distinctive[…]

    • Cryptography

    • Symmetrical primitive

  • Opening Pandora's Box: White-Box Attacks on Microsoft's PhotoDNA Perceptual Hash Function

    • June 05, 2026 (11:00 - 12:00)

    • Inria Center of the University of Rennes - Aurigny room

    Speaker : Diane Leblanc-Albarel - KU Leuven

    PhotoDNA is a widely deployed perceptual hash function used for the detection of illicit content such as Child Sexual Abuse Material (CSAM). In this talk, I will present our paper introducing the first mathematical description of Alleged PhotoDNA, a function that reproduces the outputs of PhotoDNA. Our analysis reveals several structural weaknesses: the function is piece-wise linear and[…]

    • Cryptography

    • Privacy

  • Schéma de signature à clé publique : Frobénius-UOV

    • May 29, 2026 (13:45 - 14:45)

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

    Speaker : Gilles Macario-Rat - Orange

    L'exposé présente un schéma de signature à clé publique post-quantique inspiré du schéma UOV et introduisant un nouvel outil : les formes de Frobénius. L'accent est mis sur le rôle et les propriétés des formes de Frobénius dans ce nouveau schéma : la simplicité de description, la facilité de mise en oeuvre et le gain inédit sur les tailles de signature et de clé qui bat RSA-2048 au niveau de[…]

  • Étude, caractérisation et détection de verrouillage d'anneaux oscillants utilisés dans les générateurs de nombres aléatoires.

    • May 29, 2026 (11:00 - 12:00)

    • IETR - University of Rennes - Campus de BEAULIEU - Bâtiment 11D, salle numéro 18

    Speaker : Eloise Delolme - LabHC

    Les générateurs de nombres aléatoires matériels basés sur des oscillateurs en anneau (RO-TRNGs) exploitent le jitter d’horloge comme source d’aléa afin de produire des séquences de bits aléatoires. Parmi ces architectures, le MURO-TRNG repose sur un modèle stochastique complexe qui suppose notamment l’indépendance des oscillateurs. Toutefois, dans la pratique, les oscillateurs en anneau sont[…]

    • SemSecuElec

    • TRNG

  • HDL simulation for Masked Software Verification

    • May 29, 2026 (10:00 - 11:00)

    • IETR - University of Rennes - Campus de BEAULIEU - Bâtiment 11D, salle numéro 18

    Speaker : Quentin Meunier - Sorbonne Univ. Lip6

    Masking is a countermeasure against Side-Channel Attacks (SCA) that aims to ensure that intermediate computations in an algorithm have secret-independent distributions through the use of random variables. This theoretically prevents SCAs, as power consumption is directly linked to the values manipulated by the program or hardware device. Designing a masking scheme is often non-trivial, and a[…]

    • SemSecuElec

    • Side-channel

  • Random lattices that are modules over the ring of integers

    • May 22, 2026 (13:45 - 15:45)

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

    Speaker : Nihar Gargava - Institut de Mathématiques d'Orsay

    We investigate the average number of lattice points within a ball where the lattice is chosen at random from the set of unit determinant ideal or modules lattices of some cyclotomic number field. The goal is to consider the space of such lattice as a probabilistic space and then study the distribution of lattice point counts. This is inspired by the connections of this problem to lattice-based[…]

    • Cryptography

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