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627 results
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Seminar
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Cryptography
Paramètres des carrés de codes
Speaker : Hugues Randriam - Telecom Paristech
Les produits et puissances de codes linéaires sont une construction très basique sous-jacente à de nombreuses applications du codage en informatique théorique : algorithmes de multiplication et partage de secret arithmétique, cryptanalyse de systèmes à la McEliece, décodage algébrique, construction de réseaux euclidiens, codes quantiques, transfert inconscient... Un problème fondamental[…] -
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Seminar
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Cryptography
Cryptanalyse de Chiffrements Symétriques Récents
Speaker : Virginie Lallemand - Inria
Depuis moins d'une dizaine d'années nous faisons face à l'apparition de nouvelles applications de la cryptographie symétrique, parmi lesquelles la cryptographie dédiée à la protection de petits objets connectés (dite cryptographie à bas coût) ainsi que celle adaptée aux schémas de chiffrement homomorphe. Pour ces applications, les contraintes imposées sur les chiffrements sont si fortes que les[…] -
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Seminar
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Cryptography
Bad reduction of genus 3 curves with complex multiplication
Speaker : Garcia Lorenzo - Université de Catalogne
Let C be a smooth, absolutely irreducible genus 3 curve over a number field M. Suppose that the Jacobian of C has complex multiplication by a sextic CM-field K. Suppose further that K contains no imaginary quadratic subfield. We give a bound on the primes P of M such that the stable reduction of C at P contains three irreducible components of genus 1. -
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Seminar
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Cryptography
Is there an L(1/4) algorithm for the discrete logarithm problem in algebraic curves?
Speaker : Maike Massierer - LORIA
The function field sieve, an algorithm of subexponential complexity L(1/3) that computes discrete logarithms in finite fields, has recently been improved to an L(1/4) algorithm, and subsequently to a quasi-polynomial time algorithm. Since index calculus algorithms for computing discrete logarithms in Jacobians of algebraic curves are based on very similar concepts and results, the natural question[…] -
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Seminar
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Cryptography
Learning with Errors in the Exponent
Speaker : özgür Dagdelen - Darmstadt University
We initiate the study of a novel class of group-theoretic intractability problems. Inspired by the theory of learning in presence of errors [Regev, STOC'05] we ask if noise in the exponent amplifies intractability. We put forth the notion of Learning with Errors in the Exponent (LWEE) and rather surprisingly show that various attractive properties known to ex- clusively hold for lattices carry[…] -
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Seminar
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Cryptography
SCREAM/iSCREAM: Side-Channel Resistant Authenticated Encryption with
Speaker : François-Xavier Standaert - Université Catholique de Louvain
In this talk, I will describe the family of authenticated encryption (with associated data) algorithms SCREAM and iSCREAM. They are based on Liskov et al.'s Tweakable Authenticated Encryption (TAE) mode with the new tweakable block ciphers Scream and iScream. The main desirable features of SCREAM and iSCREAM are:<br/> * A simple and regular design allowing excellent performances on a wide range of[…] -