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701 results
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Seminar
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Cryptography
Improved Cryptanalysis of Rank Metric Schemes Based on Gabidulin Codes.
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[…] -
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Seminar
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Cryptography
CRYSTALS: Dilithium and Kyber
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/> https:/[…] -
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Seminar
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Cryptography
A Modular Security Analysis of EAP and IEEE 802.11
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[…] -
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Seminar
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Cryptography
On the Construction of Lightweight S-Boxes
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[…] -
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Seminar
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Cryptography
Design de cryptographie white-box : n'oublions pas la grey-box
Speaker : Philippe Teuwen - QuarksLab
Bien que toutes les tentatives académiques actuelles pour créer des primitives cryptographiques standard en white-box aient été cassées, il y a encore un grand nombre d'entreprises qui vendent des solutions "sécurisées" de cryptographie white-box. Afin d'évaluer le niveau de sécurité de solutions en boîte blanche, nous verrons de nouvelles approches qui ne nécessitent ni connaissance des tables[…] -
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Seminar
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Cryptography
Soutenance de thèse (exceptionnellemnt jeudi à 11h): Formules de Thomae généralisées à des courbes galoisiennes résolubles sur la droite projective
Speaker : Alexandre Le Meur - Université Rennes 1
Les formules de Thomae, connues depuis le 19ème siècle, sont des relations algébriques entre les points branches d’une courbe hyperelliptique et les thêta constantes paramétrant la variété jacobienne associée à la courbe. Depuis la fin des années 80, plusieurs auteurs se sont intéressés à une généralisation de ces formules aux courbes cycliques. L’objet de cette thèse est de généraliser la[…] -