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733 results
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Seminar
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Cryptography
How fast do you heal? A taxonomy for post-compromise security in secure-channel establishment.
Speaker : Léo Robert - Université d'Amiens
Post-Compromise Security (PCS) is a property of secure-channel establishment schemes, which limits the security breach of an adversary that has compromised one of the endpoint to a certain number of messages, after which the channel heals. An attractive property, especially in view of Snowden's revelation of mass-surveillance, PCS features in prominent messaging protocols such as Signal. In this[…] -
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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
Shorter Lattice-Based Fiat-Shamir Signatures
Speaker : Julien Devevey - ANSSI
We present HAETAE (Hyperball bimodAl modulE rejecTion signAture schemE), a new lattice-based signature scheme, which we submitted to the Korean Post-Quantum Cryptography Competition for standardization. Like the NIST-selected Dilithium signature scheme, HAETAE is based on the Fiat-Shamir with Aborts paradigm, but our design choices target an improved complexity/compactness compromise that is[…] -
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Seminar
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Cryptography
Ind-cpa-d insecurity of approximate and exact homomorphic encryption schemes
Speaker : Elias Suvanto - Cryptolab
Fully Homomorphic Encryption enables the evaluation of arbitrary circuits over encrypted data while maintaining the confidentiality of the underlying messages. It greatly enhances functionality but also comes with security challenges for some applications like Threshold FHE. While the standard IND-CPA security is sufficient against honest but curious adversaries, a stronger security notion called[…] -
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Seminar
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Cryptography
Side channel analysis against AEAD lightweight cryptography
Speaker : Modou SARRY - IMT Atlantique
Les dispositifs interconnectés tels que les réseaux de capteurs, la santé, les systèmes de contrôle distribués, l’internet des objets et les systèmes cyber-physiques sont de plus en plus répandus. Cette transition vers de petits appareils engendre de nouvelles préoccupations en matière de sécurité et de vie privée, car de nombreux algorithmes cryptographiques classiques ne répondent pas toujours[…] -
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Seminar
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Cryptography
An extension of Overbeck’s attack with an application to cryptanalysis of Twisted Gabidulin-based schemes.
Speaker : Ilaria Zappatore - XLIM
In this talk, I will discuss the decoding of Gabidulin and related codes from a cryptographic point of view, pointing out that these codes can be decoded solely from the knowledge of a generator matrix. I will also present an extension of Gibson and Overbeck attacks on the generalized GPT encryption scheme (instantiated with the Gabidulin code) for different ranks of the distortion matrix. Finally[…] -