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657 results
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Seminar
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Cryptography
Evolution de la monnaie électronique divisible
Speaker : Olivier Sanders - Orange
Les systèmes de paiement électronique ont été massivement adoptés par le grand-public mais sont pourtant loin d’être anodins du point de vue du respect de la vie privée. En effet l’entité gérant ces systèmes peut déduire de chaque paiement un grand nombre d’informations sur son auteur, comme sa localisation, ses goûts et même, dans certains cas, son état de santé. Pourtant, paiement électronique[…] -
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Seminar
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Cryptography
Coercion-resistant Internet voting made practical
Speaker : Jacques Traore - Orange Labs
Internet voting offers a better voting experience since voters can cast their votes from their computers or even smartphones. By eliminating the need to visit polling places, it may attract more voters and thus increase voter turnout. However, it is still not widely spread owing to many inherent concerns such as risks entailed by the lack of private polling booths. Indeed, this may ease coercion[…] -
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Seminar
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Cryptography
Lilliput: Advances in Security and Performance Analysis
Speaker : Julien Francq - Airbus CyberSecurity
Lilliput is a block cipher that has been published in 2015 in IEEE Transactions in Computers with Thierry Berger and Marine Minier, and the seminal paper has been cited 6 times for now. This talk will summarize the results of the third-party cryptanalysis and implementations, and will show that Lilliput is still an efficient and secure cryptographic primitives. -
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Seminar
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Cryptography
Tightly Secure CCA-Secure Encryption without Pairings.
Speaker : Romain Gay - ENS
(Joint work with Dennis Hofheinz, Eike Kiltz and Hoeteck Wee) We present the first CCA-secure public-key encryption scheme based on DDH where the security loss is independent of the number of challenge ciphertexts and the number of decryption queries. Our construction extends also to the standard k-Lin assumption in pairing-free groups, whereas all prior constructions starting with Hofheinz and[…] -
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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[…] -