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742 résultats

    • Séminaire

    • Cryptographie

    Password-Authenticated Key Exchange (PAKE) from Isogenies

    • 08 décembre 2023

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

    Orateur : Sabrina Kunzweiler - Université Bordeaux

    The passwords that we use in our everyday life are often chosen to be easily memorable which makes them vulnerable to attacks. This problem is addressed by password-authenticated key exchange (PAKE). The general idea is to enable two parties who share the same (potentially weak) password to establish a strong session key. Most PAKE protocols used today are based on Diffie-Hellman key exchange in[…]

    • Séminaire

    • Cryptographie

    Updatable Public Key Encryption with Lattices

    • 23 février 2024

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

    Orateur : Calvin Abou-Haidar - ENS Lyon

    Updatable public key encryption has recently been introduced as a so- lution to achieve forward-security in the context of secure group messaging without hurting efficiency, but so far, no efficient lattice-based instantia- tion of this primitive is known. In this work, we construct the first LWE-based UPKE scheme with polynomial modulus-to-noise rate, which is CPA-secure in the standard model. At[…]

    • 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[…]

    • 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

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