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617 results

    • 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

    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.

    • Seminar

    • Cryptography

    Evolution de la monnaie électronique divisible

    • September 22, 2017

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

    Speaker : Olivier Sanders - Orange

    Les systèmes de paiement électronique ont été massivement adoptés par le grand-public mais sont pourtant loin d’être anodins du point de vue du respect de la vie privée. En effet l’entité gérant ces systèmes peut déduire de chaque paiement un grand nombre d’informations sur son auteur, comme sa localisation, ses goûts et même, dans certains cas, son état de santé. Pourtant, paiement électronique[…]

    • Seminar

    • Cryptography

    Coercion-resistant Internet voting made practical

    • March 03, 2017

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

    Speaker : Jacques Traore - Orange Labs

    Internet voting offers a better voting experience since voters can cast their votes from their computers or even smartphones. By eliminating the need to visit polling places, it may attract more voters and thus increase voter turnout. However, it is still not widely spread owing to many inherent concerns such as risks entailed by the lack of private polling booths. Indeed, this may ease coercion[…]

    • Seminar

    • Cryptography

    Lilliput: Advances in Security and Performance Analysis

    • November 17, 2017

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

    Speaker : Julien Francq - Airbus CyberSecurity

    Lilliput is a block cipher that has been published in 2015 in IEEE Transactions in Computers with Thierry Berger and Marine Minier, and the seminal paper has been cited 6 times for now. This talk will summarize the results of the third-party cryptanalysis and implementations, and will show that Lilliput is still an efficient and secure cryptographic primitives.

    • Seminar

    • Cryptography

    Où en est-on avec le calcul quantique?

    • May 19, 2017

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

    Speaker : Dimitri Petritis - IRMAR

    Le calculateur universel quantique n'a toujours pas dépassé le stade de prototype de démonstration et reste insuffisant pour faire tourner l'algorithme de factorisation de Shor sur des instances réalistes. Cependant, des avancées algorithmiques ont été faites sur des machines quantiques dédiées qui permettent d'aborder certains problèmes difficiles (au sens de la complexité); ces nouvelles[…]
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