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656 résultats

    • Séminaire

    • Cryptographie

    Traceable Constant-Size Multi-Authority Credentials

    • 29 avril 2022

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

    Orateur : Chloé Hébant - ENS

    Many attribute-based anonymous credential (ABC) schemes have been proposed allowing a user to prove the possession of some attributes, anonymously. They became more and more practical with, for the most recent papers, a constant-size credential to show a subset of attributes issued by a unique credential issuer. However, proving possession of attributes coming from K different credential issuers[…]
    • Séminaire

    • Cryptographie

    Improved Classical and Quantum Algorithms for Subset-Sum

    • 06 mars 2020

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

    Orateur : André Schrottenloher - INRIA

    We present new classical and quantum algorithms for solving random hard instances of the subset-sum problem, in which we are given n integers on n bits and try to find a subset of them that sums to a given target. This classical NP-complete problem has several applications in cryptography and underlies the security of some proposed post-quantum cryptosystems.<br/> At EUROCRYPT 2010, Howgrave[…]
    • Séminaire

    • Cryptographie

    Workshop mise en oeuvre de la cryptographie post-quantique

    • 17 novembre 2021

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

    Orateur : European CyberWeek - Rennes

    L'inscription est gratuite mais obligatoire, en particulier pour des raisons de jauges. Le nombre de places est limité. Le programme est disponible à l'adresse <a href="https://www.european-cyber-week.eu/cryptographie-post-quantique">https://www.european-cyber-week.eu/cryptographie-post-quantique</a><br/&gt;
    • Séminaire

    • Cryptographie

    Comparing the difficulty of factorization and discrete logarithm: a 240-digit experiment

    • 10 avril 2020

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

    Orateur : Emmanuel Thomé - INRIA Nancy

    We report on two new records: the factorization of RSA-240, a 795-bit number, and a discrete logarithm computation over a 795-bit prime field. Previous records were the factorization of RSA-768 in 2009 and a 768-bit discrete logarithm computation in 2016. Our two computations at the 795-bit level were done using the same hardware and software, and show that computing a discrete logarithm is not[…]
    • Séminaire

    • Cryptographie

    Soutenance de thèse: Autour de la sécurité des messageries instantanées: des solutions pour des applications multi-appareils et les communications de groupe.

    • 14 décembre 2021

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

    Orateur : Céline Duguey - DGA-Rennes

    Les applications de messagerie instantanée sécurisée, telles WhatsApp ou Signal, sont devenues incontournables pour nos communications quotidiennes.<br/> Elles apportent une sécurité caractérisée notamment par le chiffrement de bout en bout, la confidentialité persistante ou encore la sécurité après compromission. Mais ces propriétés sont généralement limitées aux communications deux à deux. L[…]
    • Séminaire

    • Cryptographie

    Divisible E-Cash from Constrained Pseudo-Random Functions

    • 06 décembre 2019

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

    Orateur : Olivier Sanders - Orange

    Electronic cash (e-cash) is the digital analogue of regular cash which aims at preserving users' privacy. Following Chaum's seminal work, several new features were proposed for e-cash to address the practical issues of the original primitive. Among them, divisibility has proved very useful to enable efficient storage and spendings. Unfortunately, it is also very difficult to achieve and, to date,[…]