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722 résultats

    • Séminaire

    • Cryptographie

    Key recovery from partial information

    • 01 octobre 2021

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

    Orateur : Gabrielle De Michelli - UC San Diego

    The security of deployed protocols not only relies on the hardness of the underlying mathematical problem but also on the implementation of the algorithms involved. Many fast modular exponentiation algorithms have piled up over the years and some implementations have brought vulnerabilities that are exploitable by side-channel attacks, in particular cache attacks.<br/> In this talk, we consider[…]

    • 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

    Key Reinstallation Attacks: Forcing Nonce Reuse in WPA2

    • 23 mars 2018

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

    Orateur : Mathy Vanhoef - KU-Leuven

    We introduce key reinstallation attacks (KRACKs). These attacks abuse features of a protocol to reinstall an already in-use key, thereby resetting nonces and/or replay counters associated to this key. We show that our novel attack technique breaks several handshakes that are used in a WPA2-protected network.<br/> All protected Wi-Fi networks use the 4-way handshake to generate fresh session keys.[…]

    • Séminaire

    • Cryptographie

    Designing and deploying post-quantum cryptography

    • 08 mars 2019

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

    Orateur : Jean-Philippe Aumasson - Teserakt AG

    I will review the hash-based signature submitted to the NIST competition jointly with Guillaume Endignoux, discussing its assurance level and performance. Then I will discuss the challenges of deploying post-quantum cryptography in an end-to-end encryption product for machine-to-machine communications.<br/> lien: http://desktop.visio.renater.fr/scopia?ID=721783***6864&autojoin
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