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723 results

    • Seminar

    • Cryptography

    Cryptography, Encryption, and Big Data

    • November 06, 2015

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

    Speaker : Hoeteck Wee - ENS

    We live in an era of "Big Data", wherein a deluge of data is being generated, collected, and stored all around us. In order to protect this data, we need to encrypt it. This raises a fundamentally new challenge in cryptography: Can we encrypt data while enabling fine-grained access control and selective computation, as is necessary to protect big, complex data? In this talk, I will present my work[…]

    • Seminar

    • Cryptography

    The SKINNY Family of Block Ciphers

    • June 03, 2016

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

    Speaker : Jérémy Jean - ANSSI

    We present a new tweakable block cipher family SKINNY, whose goal is to compete with NSA recent design SIMON in terms of hardware/software performances, while proving in addition stronger security guarantees with regards to differential/linear attacks.<br/> SKINNY has flexible block/key/tweak sizes and can also benefit from very efficient threshold implementations for side-channels protection.[…]

    • Seminar

    • Cryptography

    Broadcast encryption: combinatorial vs. algebraic methods

    • April 10, 2015

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

    Speaker : Duong-Hieu Phan - ENS

    We consider a generalisation of the encryption from "one-to-one'' to "one-to-many'' communication, i.e. broadcast encryption. The objective is to allow a center to send secret messages to a large number of receivers. The security notion in “one-to-many” communications needs to be extended beyond the notion of confidentiality in “one-to-one” encryption in order to meet practical requirements. Two[…]

    • Seminar

    • Cryptography

    Points rationnels sur une surface cubique

    • January 24, 2014

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

    Speaker : Jenny Cooley - University of Warwick

    Soit F_q un corps fini à au moins 13 éléments. Soit S une surface cubique non singulière sur laquelle il y a au moins une droite rationnelle incluse. Il existe une façon de générer les points rationnels en utilisant des opérations tangentes et sécantes qui est similaire à la loi de composition du groupe de points d'une courbe elliptique. Dans cet exposé, nous utilisons le principe des tiroirs pour[…]

    • Seminar

    • Cryptography

    GGHLite: More Efficient Multilinear Maps from Ideal Lattices

    • December 05, 2014

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

    Speaker : Adeline Langlois - ENS Lyon

    The GGH Graded Encoding Scheme (of Garg, Gentry and Halevi), based on ideal lattices, is the first plausible approximation to a cryptographic multilinear map. Unfortunately, using the security analysis the authors provided, the scheme requires very large parameters to provide security for its underlying encoding re-randomization process. Our main contributions are to formalize, simplify and[…]

    • Seminar

    • Cryptography

    Attaques quantiques contre les chiffrements par bloc composés

    • March 13, 2015

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

    Speaker : Marc Kaplan - Télécom ParisTech

    Nous étudions l'amplification de la sécurité obtenue en composant des chiffrements par bloc indépendants. Dans le cas classique, l'attaque Meet-in-the-middle est une attaque générique contre ces constructions. Si le temps nécessaire pour briser un chiffrement par bloc est t, alors cette attaque permet de briser deux chiffrements par bloc en un temps seulement 2t, alors qu'un cryptographe naïf[…]
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