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Seminar
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Cryptography
Où en est-on avec le calcul quantique?
Speaker : Dimitri Petritis - IRMAR
Le calculateur universel quantique n'a toujours pas dépassé le stade de prototype de démonstration et reste insuffisant pour faire tourner l'algorithme de factorisation de Shor sur des instances réalistes. Cependant, des avancées algorithmiques ont été faites sur des machines quantiques dédiées qui permettent d'aborder certains problèmes difficiles (au sens de la complexité); ces nouvelles[…] -
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Seminar
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Cryptography
On the Construction of Lightweight S-Boxes
Speaker : Sébastien Duval - INRIA Paris-Rocquencourt
S-Boxes are essential objects in the conception of blockciphers. Typically, an S-Box is simply a permutation (bijective function) on n bits, with n small (usually 4 or 8). Its role in a blockcipher is to bring nonlinearity to the cipher, thus an S-Box must be highly nonlinear. Several parameters of a function are used to measure nonlinearity, among which the most important are differential[…] -
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Seminar
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Cryptography
Cryptography, Encryption, and Big Data
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[…] -
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Seminar
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Cryptography
The SKINNY Family of Block Ciphers
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.[…] -
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Seminar
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Cryptography
Certification de représentations galoisiennes modulaires
Speaker : Nicolas Mascot - Université de Bordeaux 1
Nous verrons comment certifier algorithmiquement des calculs de représentations galoisiennes associés à des formes modulaires, en nous appuyant notamment sur le théorème de Khare-Wintenberger (ex conjecture de modularité de Serre) et des calculs de cohomologie des groupes afin de déterminer le groupe de Galois de certains polynômes. -
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Seminar
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Cryptography
The Analysis of Error-Correcting Capabilities of Non-Binary LDPC Codes
Speaker : Alexei Frolov - Institute for Information Transmission Problems of the Russian Academy of Sciences (IITP RAS)
Non-binary low-density parity-check (NB LDPC) codes significantly outperform their binary counterparts. Moreover, NB LDPC codes are especially good for the channels with burst errors and high-order modulations. This talk is devoted to the analysis of error-correcting capabilities of NB LDPC codes.<br/> We start with distance properties of NB LDPC codes. We consider two approaches to obtain upper[…] -