Description
This work deals with the security problems in authentication schemes employing volatile biometric features, where the authentication is indeed a comparison between a fresh feature and that enrolled during the initialization phase. We propose a security model for biometric-based authentication schemes by assuming that the biometric features to be public. Extra attentions have been paid to the privacy issues related to the sensitive relation between a biometric feature and the relevant identity. To formally study the security issues in biometric information comparison, we introduce a new cryptographic primitive, i.e., Decisional Private Information Retrieval (DPIR), inspired by the concept of Private Information Retrieval (PIR). DPIR protocols enable a client to obtain some information about an item from a database without retrieving this item directly. One DPIR protocol is constructed using Paillier's public key encryption scheme and the ElGamal scheme. Finally, we present an authentication scheme based on this DPIR protocol, proved secure in our security model.<br/> Cet exposé est basé sur des travaux communs avec Hervé Chabanne (Sagem Défense Sécurité), Malika Izabachéne, David Pointcheval, Qiang Tang, et Sébastien Zimmer (ENS).
Prochains exposés
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Random lattices that are modules over the ring of integers
Orateur : Nihar Gargava - Institut de Mathématiques d'Orsay
We investigate the average number of lattice points within a ball where the lattice is chosen at random from the set of unit determinant ideal or modules lattices of some cyclotomic number field. The goal is to consider the space of such lattice as a probabilistic space and then study the distribution of lattice point counts. This is inspired by the connections of this problem to lattice-based[…]-
Cryptography
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Schéma de signature à clé publique : Frobénius-UOV
Orateur : Gilles Macario-Rat - Orange
L'exposé présente un schéma de signature à clé publique post-quantique inspiré du schéma UOV et introduisant un nouvel outil : les formes de Frobénius. L'accent est mis sur le rôle et les propriétés des formes de Frobénius dans ce nouveau schéma : la simplicité de description, la facilité de mise en oeuvre et le gain inédit sur les tailles de signature et de clé qui bat RSA-2048 au niveau de[…] -
Yoyo tricks with a BEANIE
Orateur : Xavier Bonnetain - Inria
TBD-
Cryptography
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Symmetrical primitive
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