Filter by content type

Select one or more filters. This choice will reload the page to display the filtered results.

Remove all filters

644 results

    • Seminar

    • Cryptography

    identity-based encryption with rank metric

    • September 15, 2017

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

    Speaker : Adrien Hauteville - Université de Limoges

    Code-based cryptography has a long history, almost as long as the history of public-key encryption (PKE). While we can construct almost all primitives from codes such as PKE, signature, group signature etc, it is a long standing open problem to construct an identity-based encryption from codes. We solve this problem by relying on codes with rank metric. The concept of identity-based encryption […]

    • Seminar

    • Cryptography

    Improved Cryptanalysis of Rank Metric Schemes Based on Gabidulin Codes.

    • February 03, 2017

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

    Speaker : Hervé Talé Kalachi - Université de Rouen et Université de Yaoundé, Cameroun

    In this presentation, we prove that any variant of the GPT cryptosystem which uses a right column scrambler over the extension field as advocated by the works of Gabidulin et al. with the goal to resist to Overbeck’s structural attack are actually still vulnerable to that attack. We show that by applying the Frobenius operator appropriately on the public key, it is possible to build a Gabidulin[…]

    • Seminar

    • Cryptography

    CRYSTALS: Dilithium and Kyber

    • November 10, 2017

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

    Speaker : Damien Stehlé - ENS de Lyon

    Kyber -- a Key Exchange Mechanism -- and Dilithium -- a digital signature -- are the two components of the Cryptographic Suite for Algebraic Lattices (CRYSTALS). I will present the intractable problems underlying their security, overview their design and comment their practical performance. The talk is based on the following articles:<br/> https://eprint.iacr.org/2017/633.pdf<br/&gt; https:/[…]

    • Seminar

    • Cryptography

    A Modular Security Analysis of EAP and IEEE 802.11

    • April 07, 2017

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

    Speaker : Haakon Jacobsen - TBD

    The Extensible Authentication Protocol (EAP) is a widely used three-party authentication framework that allows a client to connect to a wireless access point it does not share a secret with, using a mutually trusted server. EAP is often found in enterprise networks or large organizations to provide central key-management and user authentication; one prime example being the eduroam network.<br/> In[…]

    • Seminar

    • Cryptography

    On the Construction of Lightweight S-Boxes

    • December 15, 2017

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

    Speaker : Sébastien Duval - INRIA Paris-Rocquencourt

    S-Boxes are essential objects in the conception of blockciphers. Typically, an S-Box is simply a permutation (bijective function) on n bits, with n small (usually 4 or 8). Its role in a blockcipher is to bring nonlinearity to the cipher, thus an S-Box must be highly nonlinear. Several parameters of a function are used to measure nonlinearity, among which the most important are differential[…]

    • Seminar

    • Cryptography

    Journée de rentrée

    • September 18, 2015

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

    Speaker : Géométrie et Algèbre Effectives - IRMAR

    Divers exposés.
Page top