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718 results
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Seminar
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Cryptography
Correction of dual lattice attacks
Speaker : Kevin Carrier - CY Cergy
The security of cryptographic systems such as Kyber and Dilithium (currently undergoing standardization by NIST) fundamentally hinges on the Learning With Errors (LWE) problem. However, the state of the art for attacking this problem is not yet entirely clear. Specifically, the validity of dual attacks on LWE is currently under scrutiny due to their analyses relying on heuristics that have proven[…] -
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Seminar
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Cryptography
Generic Attack on Duplex-Bases AEAD Modes using Random Function Statistics
Speaker : Rachelle Heim Boissier - Inria
Duplex-based authenticated encryption modes with a sufficiently large key length are proven to be secure up to the birthday bound 2^(c/2), where c is the capacity. However this bound is not known to be tight and the complexity of the best known generic attack, which is based on multicollisions, is much larger: it reaches 2^c/α where α represents a small security loss factor. There is thus an[…] -
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Seminar
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Cryptography
Password-Authenticated Key Exchange (PAKE) from Isogenies
Speaker : Sabrina Kunzweiler - Université Bordeaux
The passwords that we use in our everyday life are often chosen to be easily memorable which makes them vulnerable to attacks. This problem is addressed by password-authenticated key exchange (PAKE). The general idea is to enable two parties who share the same (potentially weak) password to establish a strong session key. Most PAKE protocols used today are based on Diffie-Hellman key exchange in[…] -
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Seminar
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Cryptography
Updatable Public Key Encryption with Lattices
Speaker : Calvin Abou-Haidar - ENS Lyon
Updatable public key encryption has recently been introduced as a so- lution to achieve forward-security in the context of secure group messaging without hurting efficiency, but so far, no efficient lattice-based instantia- tion of this primitive is known. In this work, we construct the first LWE-based UPKE scheme with polynomial modulus-to-noise rate, which is CPA-secure in the standard model. At[…] -
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Working group
Modélisation statistique et sécurité des générateurs d'aléa pour la cryptographie
Speaker : David Lubicz - DGA, IRMAR
Dans cet exposé on essaie d'expliquer ce que l'on entend pas méthodes statistiques et on donne des exemples concrets d'application dans la cybersécurité.-
Cryptography
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Working group
Analyse statistique des extrêmes pour la modélisation d'évènements rares ou atypiques
Speaker : Gilles Stupfler - ENSAI
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