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701 résultats

    • Séminaire

    • Cryptographie

    How fast do you heal? A taxonomy for post-compromise security in secure-channel establishment.

    • 10 novembre 2023

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

    Orateur : Léo Robert - Université d'Amiens

    Post-Compromise Security (PCS) is a property of secure-channel establishment schemes, which limits the security breach of an adversary that has compromised one of the endpoint to a certain number of messages, after which the channel heals. An attractive property, especially in view of Snowden's revelation of mass-surveillance, PCS features in prominent messaging protocols such as Signal. In this[…]

    • Séminaire

    • Cryptographie

    Shorter Lattice-Based Fiat-Shamir Signatures

    • 26 janvier 2024

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

    Orateur : Julien Devevey - ANSSI

    We present HAETAE (Hyperball bimodAl modulE rejecTion signAture schemE), a new lattice-based signature scheme, which we submitted to the Korean Post-Quantum Cryptography Competition for standardization. Like the NIST-selected Dilithium signature scheme, HAETAE is based on the Fiat-Shamir with Aborts paradigm, but our design choices target an improved complexity/compactness compromise that is[…]

    • Séminaire

    • Cryptographie

    Ind-cpa-d insecurity of approximate and exact homomorphic encryption schemes

    • 29 mars 2024

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

    Orateur : Elias Suvanto - Cryptolab

    Fully Homomorphic Encryption enables the evaluation of arbitrary circuits over encrypted data while maintaining the confidentiality of the underlying messages. It greatly enhances functionality but also comes with security challenges for some applications like Threshold FHE. While the standard IND-CPA security is sufficient against honest but curious adversaries, a stronger security notion called[…]

    • 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

    • Séminaire

    • SoSysec

    Privacy in The 5G-AKA Authentication Protocol

    • 18 janvier 2019

    • Inria Center of the University of Rennes - - See the page of each talk for the room.

    Orateur : Adrien Koutsos (LSV)

    The 5G mobile communications standards are being finalized, and drafts are now available. This standard describes the 5G-AKA authentication and key exchange protocol. The previous version of AKA (3G and 4G) are well-known for their lack of privacy against an active adversary (e.g. a user can be massively tracked using IMSI-catcher). This new version of AKA tries to offer more privacy, notably[…]
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