522 résultats
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Systèmes de chiffrement par bloc minimalistes, obfuscation et implémentations en "boite blanche"
Orateur : Charles Bouillaguet - Université de Lille 1
La plupart du temps, la sécurité des systèmes de chiffrement est évaluée en supposant que les adversaires interagissent avec le dispositif à travers une "interface", mais qu'ils n'ont pas le système de chiffrement sous la main pour étudier les détails de son fonctionnement interne. En effet, le fonctionnement de tels systèmes repose largement sur le fait qu'ils contiennent des informations[…] -
Gröbner Bases Techniques in Post-Quantum Cryptography
Orateur : Ludovic Perret - LIP6
After the publication of Shor's algorithm, it became evident the most popular public-key cryptographic systems that rely on the integer factorization problem or on the discrete logarithm problem would be easily solvable using large enough quantum computers (if such quantum computers are ever built). That triggered a vivid interest in the research of cryptographic algorithms (mostly public-key[…] -
New multilinear maps over the integers
Orateur : Jean-Sébastien Coron - Université du Luxembourg
In the last few years, cryptographic multilinear maps have proved their tremendous potential as building blocks for new constructions, in particular the first viable approach to general program obfuscation. After the first candidate construction by Garg, Gentry and Halevi (GGH) based on ideal lattices, a second construction over the integers was described by Coron, Lepoint and Tibouchi (CLT).[…] -
Disjunctions for Hash Proof Systems: New Constructions and Applications
Orateur : Fabrice Ben Hamouda - ENS
Hash Proof Systems were first introduced by Cramer and Shoup (Eurocrypt'02) as a tool to construct efficient chosen-ciphertext-secure encryption schemes. Since then, they have found many other applications, including password authenticated key exchange, oblivious transfer, and zero-knowledge arguments. One of the aspects that makes hash proof systems so interesting and powerful is that they can be[…] -
Broadcast encryption: combinatorial vs. algebraic methods
Orateur : 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[…] -
Constructive cryptography and composability; de-constructing TLS
Orateur : Cristina Onete - IRISA, Université Rennes 1