Team Cascade

Overall Objectives
Scientific Foundations
Application Domains
New Results
Contracts and Grants with Industry
Other Grants and Activities

Section: New Results

New Primitives (Anonymity)

Participants : Michel Ferreira Abdalla, Georg Fuchsbauer, Malika Izabachène, David Pointcheval, Damien Vergnaud.

We focused on the specific topic of anonymous electronic money: e-cash can be spent and even transfered (to an other user) in an anonymous way. However, in case of double-spending, a trusted third party is able to open the identity of the defrauder. Efficiency (computation and communication) is also considered.

Signing in the name of a group of players is a fundamental primitive in cryptography: ring signatures allow to do so in a perfect anonymous way; group signatures provide the ability to open the identity of the actual signer in case of abuse.

These papers develop models and tools in order to delegate some rights, in such a way that the delegatee's signature is indistinguishable from the delegator's signature: anonymity is guaranteed, except for the delegator who can recover the identity of the actual delegatee who signed in his name.


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