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656 résultats

    • Séminaire

    • Cryptographie

    Computational assumptions in the quantum world

    • 22 novembre 2024 (13:45 - 14:45)

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

    Orateur : Alex Bredariol Grilo - LIP6 (CNRS / Sorbonne Université)

    QKD is a landmark of how quantum resources allow us to implement cryptographicfunctionalities with a level of security that is not achievable only with classical resources.However, key agreement is not sufficient to implement all functionalities of interest, and it iswell-known that they cannot be implemented with perfect security, even if we have accessto quantum resources. Thus, computational[…]
    • Cryptography

    • Séminaire

    • Cryptographie

    MinRank Gabidulin encryption scheme on matrix codes

    • 11 octobre 2024 (13:45 - 14:45)

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

    Orateur : Adrien Vinçotte - XLIM, Université de Limoges

    The McEliece scheme is a generic framework allowing to use any error correcting code which disposes of an efficient decoding algorithm to design an encryption scheme by hiding a generator matrix of this code.In the context of rank metric, we propose a generalization of the McEliece frame to matrix codes. From a vector code, we compute a matrix version of this code, that is hidden in such a way[…]
    • Cryptography

    • Asymmetric primitive

    • Séminaire

    • Cryptographie

    Polytopes in the Fiat-Shamir with Aborts Paradigm

    • 29 novembre 2024 (13:45 - 14:45)

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

    Orateur : Hugo Beguinet - ENS Paris / Thales

    The Fiat-Shamir with Aborts paradigm (FSwA) uses rejection sampling to remove a secret’s dependency on a given source distribution.  Recent results revealed that unlike the uniform distribution in the hypercube, both the continuous Gaussian and the uniform distribution within the hypersphere minimise the rejection rate and the size of the proof of knowledge. However, in practice both these[…]
    • Cryptography

    • Asymmetric primitive

    • Mode and protocol

    • Séminaire

    • Cryptographie

    Improved Provable Reduction of NTRU and Hypercubic Lattices

    • 18 octobre 2024 (13:45 - 14:45)

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

    Orateur : Henry Bambury - ENS Paris

    Lattice-based cryptography typically uses lattices with special properties to improve efficiency.  We show how blockwise reduction can exploit lattices with special geometric properties, effectively reducing the required blocksize to solve the shortest vector problem to half of the lattice's rank, and in the case of the hypercubic lattice , further relaxing the approximation factor of blocks to . […]
    • Cryptography

    • Asymmetric primitive

    • Séminaire

    • SoSysec

    Safety-Security Convergence of Industrial Control Systems

    • 13 décembre 2024 (11:00 - 12:00)

    • Inria Center of the University of Rennes - Room Aurigny

    Orateur : Maxime Puys - Université Clermont Auvergne - IUT de Clermont-Ferrand

    Industrial Control Systems (ICS) are designed to provide a service, such as power generation or water treatment, while protecting people, assets, and the environment against hazards. However, ICS now integrate Information Technology (IT) and are interconnected with the outside world such as the Internet, thereby exposing their infrastructures to cyberattacks. Cyberattacks have thus become new[…]
    • Risk Assessment

    • SoSysec

    • Intrusion detection

    • Thesis defense

    • Side-channel

    Optimizing data leakage exploitation in the context of screaming-channel attack

    • 27 septembre 2024 (10:00 - 12:00)

    • CentraleSupélec, Rennes campus, avenue de la boulaie, 35510 Cesson-Sévigné - Room : salle téléTD « UBL »

    PhD Defense : Jérémy GUILLAUME Abstract: This thesis studies the challenges of implementing a screaming-channel attack: an attack exploiting the electromagnetic leakage and mixed-signal nature (analog and digital parts on the same silicon die) of a victim system to extract its secret data at a distance of several meters. In particular, Jeremy Guillaume explored various methods enabling an attacker[…]