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741 results
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Seminar
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Cryptography
Optimisation des Principaux Composants des Chiffrements par Bloc
Speaker : Baptiste Lambin - soutenance de thèse salle Métivier à l'IRISA, 14h
La sécurité des chiffrements par bloc évolue constamment au fur et à mesure que de nouvelles techniques de cryptanalyse sont découvertes. Lors de la conception de nouveaux chiffrements par bloc, il est donc nécessaire de considérer ces nouvelles techniques dans l'analyse de sécurité. Dans cette thèse, nous montrons comment construire certaines opérations internes des chiffrements par bloc pour[…] -
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Seminar
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Cryptography
Learning With Errors and Extrapolated Dihedral Cosets Problem
Speaker : Weiqiang Wen - ENS de Lyon
The hardness of the learning with errors (LWE) problem is one of the most fruitful resources of modern cryptography. In particular, it is one of the most prominent candidates for secure post-quantum cryptography. Understanding its quantum complexity is therefore an important goal. We show that under quantum polynomial time reductions, LWE is equivalent to a relaxed version of the dihedral coset[…] -
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Seminar
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Cryptography
Quantum security of the Fiat-Shamir transform of commit and open protocols
Speaker : André Chailloux - INRIA
Applying the Fiat-Shamir transform on identification schemes is one of the main ways of constructing signature schemes. While the classical security of this transformation is well understood, there are still many cases for which we do not know whether the quantum security holds or not. In this paper, we show that if we start from a commit-and-open identification scheme, where the prover first[…] -
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Seminar
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Cryptography
Practical Strategy-Resistant Privacy-Preserving Elections
Speaker : Quentin Santos - Orange
Recent advances in cryptography promise to let us run com- plex algorithms in the encrypted domain. However, these results are still mostly theoretical since the running times are still much larger than their equivalents in the plaintext domain. In this context, Majority Judgment is a recent proposal for a new voting system with several interesting practical advantages, but which implies a more[…] -
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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[…] -