Filter by content type

Select one or more filters. This choice will reload the page to display the filtered results.

Remove all filters

655 results

    • Seminar

    • Cryptography

    Improving greedy nonrandomness detectors for stream ciphers

    • March 24, 2017

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

    Speaker : Paul Stankovski - Université de Lund

    We consider the problem of designing distinguishers and nonrandomness detectors for stream ciphers using the maximum degree monomial test. We construct an improved algorithm to determine the subset of key and IV-bits used in the test. The algorithm is generic, and can be applied to any stream cipher. In addition to this, the algorithm is highly tweakable, and can be adapted depending on the[…]
    • Seminar

    • Cryptography

    Towards the Implementation of Efficient and Distributable Pairing-based Crypto Library

    • December 01, 2017

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

    Speaker : Al-Amin Khandaker - Okayama University

    Pairing-based cryptography is popular among the cryptographic protocol researchers for its eccentric provable security. Protocol side researchers often see pairing as a black box. They often need to test the correctness of their proposal. Typically, mathematicians and cryptography engineers try to make the underlying operations of pairing-based crypto efficient. In addition, different types of[…]
    • Seminar

    • Cryptography

    Encryption Switching Protocols

    • November 25, 2016

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

    Speaker : Geoffroy Couteau - ENS

    (Joint work with Thomas Peters, and David Pointcheval) We put forth a novel cryptographic primitive: encryption switching protocol (ESP), allowing to switch between two encryption schemes. Intuitively, this two-party protocol converts given ciphertexts from one scheme into ciphertexts of the same messages in the other scheme, for any polynomial number of switches, in any direction. Although ESP is[…]
    • Seminar

    • Cryptography

    Adaptive Oblivious Transfer with Access Control for NC1 from LWE

    • June 16, 2017

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

    Speaker : Fabrice Mouhartem - Ens Lyon

    Adaptive oblivious transfer (OT) is a protocol where a sender initially commits to a database M_1, …, M_N. Then, a receiver can query the sender up to k times with private indexes ρ_1, …, ρ_k so as to obtain M_{ρ_1}, …, M_{ρ_k} and nothing else. Moreover, for each i ∈ [k], the receiver’s choice ρ_i may depend on previously obtained messages {M_{ρ_j}}_{j< i} . Oblivious transfer with access control[…]
    • Seminar

    • Cryptography

    Soutenance de thèse : Algorithmes de recherche sur bases de données chiffrées

    • January 08, 2018

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

    Speaker : Raphaël Bost - Université Rennes 1

    La recherche sur les bases de données chiffrées vise à rendre e cace une tâche apparemment simple : déléguer le stockage de données à un serveur qui ne serait pas de con ance, tout en conservant des fonctionnalités de recherche. Avec le développement des services de stockage dans le Cloud, destinés aussi bien aux entreprises qu’aux individus, la mise au point de solutions e caces à ce problème est[…]
    • Seminar

    • Cryptography

    Algebraic geometry meets microcontrollers: Efficient, compact key

    • January 20, 2017

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

    Speaker : Ben Smith - Ecole polytechnique

    This talk will describe how we have applied the theory of Kummer surfaces --classic objects in algebraic geometry-- to produce compact, high-speed software for secure key exchange and signatures on microcontrollers. This is joint work with Brian Chung, Craig Costello, Joost Renes, Peter Schwabe, and Lejla Batina.