France Telecom

Matthieu Gaud

Sébastien Canard

Jacques Traore

In a fair blind signature process, a user interacts with a signer in order to complete a 7-tuple (A,e,s,t,x,x,m) such that A=aaaaaa(mod n), where a, a, a, a, aand aand n are elements of the Signer's public key (PUBK). During the signature-issuing phase the user (U) provides the signer (S) with a data element (a) encrypted according to a key (f) known to a trusted authority (TA), and this data element (a) is disclosed during transmission of the signed message. Similarly, the signed message is transmitted associated with second encrypted data comprising a second data element (a) encrypted according to a key (f) known to the trusted authority (TA), and this second data element (a) is disclosed to the Signer during the signature-issuing phase. Thus, the trusted authority (TA) can revoke the anonymity of the digital signature.

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Courseulles-sur-Mer, France

Matthieu Gaud