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679 résultats

    • Séminaire

    • Cryptographie

    Journées C2

    • 04 avril 2025 (00:00 - 18:00)

    • Pornichet

    • Séminaire

    • Cryptographie

    Updatable Encryption from Group Actions

    • 24 janvier 2025 (13:45 - 14:45)

    • IRMAR - Université de Rennes - Campus Beaulieu Bat. 22, RDC, Rennes - Amphi Lebesgue

    Orateur : Maxime Romeas - ANSSI

    Updatable Encryption is a variant of symmetric encryption that allows to rotate the encryption key in the outsourced storage setting while minimizing the bandwith used. Indeed, any third party can update ciphertexts to the new key using a token provided by the key holder. UE schemes aim at providing strong confidentiality guarantees against adversaries that can corrupt keys and tokens.  In this[…]

    • Séminaire

    • Cryptographie

    Séminaire C2

    • 17 janvier 2025 (11:30 - 17:00)

    • Nancy

    11h30  Katharina Boudgoust (CR CNRS, LIRMM) : The Power of NAPs: Compressing OR-Proofs via Collision-Resistant HashingProofs of partial knowledge allow for proving the validity of t out of n different statements without revealing which ones those are. In this presentation, we describe a new approach for transforming certain proofs system into new ones that allows for proving partial knowledge. The[…]

    • Séminaire

    • SemSecuElec

    Measurement the thermal component of clock jitter used as entropy source by TRNGs

    • 28 février 2025 (11:00 - 12:00)

    • Inria Center of the University of Rennes - - IRISA - Salle Aurigny (D165)

    Orateur : Arturo GARAY - STMicroelectronics

    Introduction Measuring the thermal component of clock jitter as an entropy source for True Random Number Generators (TRNGs) is compulsory for the security and evaluation of clock-jitter based TRNGs. However, identifying and isolating the local thermal noise component from other noise sources, particularly flicker noise, while performing a precise measurement remains a challenge. Current[…]

    • SemSecuElec

    • TRNG

    • Séminaire

    • SemSecuElec

    Remote data extraction through retroreflector hardware implants

    • 20 décembre 2024 (10:00 - 11:00)

    • Inria Center of the University of Rennes - Espace de conférences

    Orateur : François Sarrazin, Pierre Granier - University of Rennes, IETR (UMR 6164)

    Electromagnetic leakage eavesdropping is an increasingly accessible attack vector due to the democratization of software-defined radio. "TEMPEST" attacks rely on passively listening to the unwanted electromagnetic emanations of a target (computer screen, low speed USB peripheral…) in order to retrieve the transmitted data. However, the range and properties of such leakages are unpredictable.[…]

    • SemSecuElec

    • Séminaire

    • Cryptographie

    Euclidean lattice and PMNS: arithmetic, redundancy and equality test

    • 31 janvier 2025 (13:45 - 14:45)

    • IRMAR - Université de Rennes - Campus Beaulieu Bat. 22, RDC, Rennes - Amphi Lebesgue

    Orateur : Fangan Yssouf Dosso - Laboratoire SAS, École des Mines de Saint-Étienne

    The Polynomial Modular Number System (PMNS) is an integer number system that aims to speed up arithmetic operations modulo a prime number p. This system is defined by a tuple (p, n, g, r, E), where p, n, g and r are positive integers, and E is a polynomial with integer coefficients, having g as a root modulo p. Arithmetic operations in PMNS rely heavily on Euclidean lattices. Modular reduction in[…]
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