Fair Blind Signatures without Random Oracles

A fair blind signature is a blind signature with revocable anonymity and unlinkability, i.e., an authority can link an issuing session to the resulting signature and trace a signature to the user who requested it. In this paper we first revisit the security model for fair blind signatures given by Hufschmitt and Traor´e in 2007. We then give the first practical fair blind signature scheme with a security proof in the standard model. Our scheme satisfies a stronger variant of the Hufschmitt-Traor´e model. Keywords. Blind signatures, Revocable anonymity, Standard model, Groth-Sahai proof system.

• Type: Conference
• Year: 2010
• Where: AFRICACRYPT
• Authors: Georg Fuchsbauer, Damien Vergnaud
• Keywords: AFRICACRYPT 2010, Blind Signatures, Cryptology, Fair Blind Signature, Revocable Anonymity