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Seminar
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Cryptography
On the related-key attacks against AES
Speaker : Vincent Rijmen - University of Graz
In a recent series of papers, Alex Biryukov, Dmitry Khovratovich (et al.) presented a number of related-key attacks on AES and reduced-round versions of AES. The most impressive of these were presented at Asiacrypt 2009: related-key attacks against the full AES-256 and AES-192. The publication of these attacks has led some people to question the security of AES.<br/> While we agree that the[…] -
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Seminar
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Cryptography
An Algebraic Decoding of Negacyclic Codes Over the Integers Modulo 4
Speaker : Eimar Byrne - University College Dublin
In the 1960s, Berlekamp introduced the negacyclic codes over GF(p) and described an efficient decoder that corrects any t Lee errors, where p > 2t. We consider this family of codes, defined over the integers modulo 4. We show that if a generator polynomial for a Z4 negacyclic code C has roots a^{2j+1} for j=0,...,t, where a is a primitive 2n th root of unity in a Galois extension of Z4, then C is[…] -
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Seminar
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Cryptography
Calcul du Groupe de Galois
Speaker : Guénael Renault - LIP6
Lors de son édification, la théorie de Galois a été établie de manière constructive. Même si la méthode de base pour le calcul du groupe de Galois était déjà connue des mathématiciens de la fin du 19ème siècle (par exemple exposée dans l'ouvrage de Jordan), il faut attendre les techniques de la théorie algorithmique des nombres pour avoir des algorithmes efficaces permettant un tel calcul.<br/>[…] -
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Seminar
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Cryptography
AES-GCM plus rapide et résistant contre
Speaker : Peter Schwabe - Eindhoven University of Technology
Cet exposé a pour but de présenter une nouvelle implantation d'AES et d'AES-GCM. C'est la première qui résiste aux attaques temporelles et qui est en même temps efficace pour chiffrer des paquets courts.<br/> J'expliquerai pourquoi les méthodes classiques pour implanter AES sont vulnérables aux attaques dites de "cache-timing". Ensuite, je décrirai la technique de "bit-slicing" et détaillerai[…] -
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Seminar
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Cryptography
How to break Remote Keyless Entry Systems.
Speaker : Timo Kasper - Bochum
KeeLoq remote keyless entry systems are widely used for access control purposes such as garage openers or car door systems. The talk will present the first successful differential power analysis attacks on numerous commercially available products employing KeeLoq code hopping. They allow for efficiently revealing both the secret key of a remote transmitter and the manufacturer key stored in a[…] -
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Seminar
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Cryptography
Lifting techniques for polynomial system solving.
Speaker : Eric Schost - University of Western Ontario
Through examples taken from point-counting problems or invariant theory, I will give an overview of how lifting techniques (that is, symbolic versions of Newton's iteration) can help us solve polynomial systems.<br/> I will review the key ingredients needed to put this kind of approach to practice, such as degree bounds or efficient arithmetic for polynomials and power series, and hint at the[…] -