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Springer Verlag, Lecture Notes in Computer Science, p. 255-270

DOI: 10.1007/3-540-44598-6_16

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A Practical and Provably Secure Coalition-Resistant Group Signature Scheme

Proceedings article published in 2000 by Giuseppe Ateniese, Jan Camenisch, Marc Joye, Gene Tsudik
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

A group signature scheme allows a group member to sign messages anonymously on behalf of the group. However, in the case of a dispute, the identity of a signature's originator can be revealed (only) by a designated entity. The interactive counterparts of group signatures are identity escrow schemes or group identification scheme with revocable anonymity. This work introduces a new provably secure group signature and a companion identity escrow scheme that are significantly more efficient than the state of the art. In its interactive, identity escrow form, our scheme is proven secure and coalition-resistant under the strong RSA and the decisional Diffie-Hellman assumptions. The security of the noninteractive variant, i.e., the group signature scheme, relies additionally on the Fiat-Shamir heuristic (also known as the random oracle model).