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11 résultats

    • Séminaire

    • Cryptographie

    Efficient zero-knowledge proofs and arguments in the CL framework

    • 07 mars 2025 (13:45 - 14:45)

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

    Orateur : Agathe Beaugrand - Institut de Mathématiques de Bordeaux

    The CL encryption scheme, proposed in 2015 by Castagnos and Laguillaumie, is a linearly homomorphic encryption scheme, based on class groups of imaginary quadratic fields. The specificity of these groups is that their order is hard to compute, which means it can be considered unknown. This particularity, while being key in the security of the scheme, brings technical challenges in working with CL,[…]
    • Séminaire

    • Cryptographie

    Constant-time lattice reduction for SQIsign

    • 14 mars 2025 (13:45 - 14:45)

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

    Orateur : Sina Schaeffler - IBM Research

    SQIsign is an isogeny-based signature scheme which has recently advanced to round 2 of NIST's call for additional post-quantum signatures. A central operation in SQIsign is lattice reduction of special full-rank lattices in dimension 4. As these input lattices are secret, this computation must be protected against side-channel attacks. However, known lattice reduction algorithms like the famous[…]
    • Séminaire

    • SoSysec

    Tackling obfuscated code through variant analysis and Graph Neural Networks

    • 21 mars 2025 (11:00 - 12:00)

    • Inria Center of the University of Rennes - - Petri/Turing room

    Orateur : Roxane Cohen and Robin David - Quarkslab

    Existing deobfuscation techniques usually target specific obfuscation passes and assume a prior knowledge of obfuscated location within a program. Also, some approaches tend to be computationally costly. Conversely, few research consider bypassing obfuscation through correlation of various variants of the same obfuscated program or a clear program and a later obfuscated variant. Both scenarios are[…]
    • Malware analysis

    • Binary analysis

    • Obfuscation

    • Séminaire

    • Cryptographie

    Circuit optimisation problems in the context of homomorphic encryption

    • 21 mars 2025 (13:45 - 14:45)

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

    Orateur : Sergiu Carpov - Arcium

    Fully homomorphic encryption (FHE) is an encryption scheme that enables the direct execution of arbitrary computations on encrypted data. The first generation of FHE schemes began with Gentry's groundbreaking work in 2019. It relies on a technique called bootstrapping, which reduces noise in FHE ciphertexts. This construction theoretically enables the execution of any arithmetic circuit, but[…]
    • Séminaire

    • SemSecuElec

    Cryptanalytical extraction of complex Neural Networks in black-box settings

    • 28 mars 2025 (10:00 - 11:00)

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

    Orateur : Benoit COQUERET - INRIA, Thales CESTI

    With the widespread development of artifical intelligence, Deep Neural Networks (DNN) have become valuable intellectual property (IP). In the past few years, software and hardware-based attacks targetting at the weights of the DNN have been introduced allowing potential attacker to gain access to a near-perfect copy of the victim's model. However, these attacks either fail against more complex[…]
    • SemSecuElec

    • Side-channel

    • Machine learning

    • Séminaire

    • Cryptographie

    TBD

    • 28 mars 2025 (13:45 - 14:45)

    • Salle Guernesey, ISTIC

    Orateur : Maria Corte-Real Santos - ENS Lyon

    TBD
    • Cryptography