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633 results
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Seminar
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Cryptography
(Yet Another) Analysis of the Linux Random Number Generator
Speaker : Andrea Roeck - INRIA Rocquencourt
The Linux random number generator is part of the kernel since 1994. It collects entropy from user input, interrupts and disk movements and claims to output high quality random numbers. There are two different versions: /dev/random which blocks if the internal entropy count goes to zero and /dev/urandom which is faster since it produces as many bits as the user wants to. The only official[…] -
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Seminar
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Cryptography
RSA problems with Lattice Reduction
Speaker : Alexander May - Technische Universität Darmstadt
This survey addresses the problems of factoring and inverting the RSA function. We define practically relevant relaxed instances of these problems that can be solved in polynomial time. These problem instances are modelled by polynomial equations with small roots. In order to recover the roots, we make use of a method due to Coppersmith which is in turn based on the famous LLL lattice reduction.[…] -
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Seminar
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Cryptography
Standard models for finite fields
Speaker : Bart de Smit - University of Leiden
We give a deterministic polynomial time algorithm that on input two finite fields of the same cardinality produces an isomorphism between the two. Moreover, if for three finite fields of the same cardinality one applies the algorithm to the three pairs of fields then one obtains a commutative triangle. The algorithm depends on the definition of F_q as an actual field rather than a field up to[…] -
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Seminar
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Cryptography
Towards Trustworthy Electronic Voting Systems
Speaker : Jacques Traoré - France telecom
We will focus on this talk on electronic voting which emulates traditional voting in a networked environment. We will first introduce the model of electronic voting. In particular, we will present the security requirements that an electronic voting system must fulfil in order to be a proper substitute for a paper-ballot system. We will also briefly review the cryptographic tools generally used to[…] -
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Seminar
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Cryptography
Quelques aspects algorithmiques de la cryptographie
Speaker : David Lubicz - DGA et Université Rennes I
La cryptographie à clef publique, qui fut inventée dans les années soixante-dix par W. Diffie et M. Hellman, apporte par rapport à la cryptographie symétrique un certain nombre de fonctionnalités particulièrement intéressantes pour les applications pratiques. Sa mise en oeuvre repose le plus souvent sur la difficulté calculatoire de certains problèmes issus de la théorie des nombres. De là, on[…] -
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Seminar
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Cryptography
An infinite class of balanced functions with optimal algebraic
Speaker : Claude Carlet - Université Paris 8
Travail en commun avec Keqin Feng, Tsinghua University, Pékin.<br/> After the improvement by Courtois and Meier of the algebraic attacks on stream ciphers and the introduction of the related notion of algebraic immunity, several constructions of infinite classes of Boolean functions with optimum algebraic immunity have been proposed. All of them gave functions whose algebraic degrees are[…] -