Section: New Results

Anonymous Credentials

Participants : Stéphanie Delaune, Malika Izabachène, Graham Steel.

Anonymous credentials plays an important role in non-interactive anonymous authentication: they allow a user to obtain certificates from organization and subsequently prove their possession in such a way that transactions of a same user remain unlinkable. In collaboration with Benoit Libert and Damien Vergnaud, Malika Izabachène present an anonymous credential scheme [39] in which a user can prove possession of appropriate attributes in an non-interactive fashion, by showing that these attributes satisfy a certain predicate (different type of predicates are handled).

Following this line of research on anonymous protocols, Stéphanie Delaune, Malika Izabachène and Graham Steel formalize unlinkability in the pi-calculus framework. They are exploring several scenarios in order to capture many adversarial strategies, especially in the context of low-cost devices, in which sensitive data are stored and identifier means are exchanged through public channels.