A Fully-Functional Group Signature Scheme over Only Known-Order Group

The concept of group signature allows a group member to sign message anonymously on behalf of the group. In the event of a dispute, a designated entity can reveal the identity of a signer. Previous group signature schemes use an RSA signature based membership certificate and a signature based on a proof of knowledge(SPK) in order to prove the possession of a valid membership certificate. In these schemes, SPK is generated over an unknown-order group, which requires more works and memory compared with a publicly-known-order group. Recently, a group signature based on a known-order group is proposed. However, it requires an unknown-order group as well as a known-order group. Furthermore, unfortunately, it does not provide the function of revocation. In this paper, we propose the group signature scheme based on only publicly-known-order groups. Our scheme improves the NybergRueppel signature to fit for generating membership certificates and uses SPKs over a cyclic group whose order is pub...

• Type: Conference
• Year: 2004
• Where: ACNS
• Authors: Atsuko Miyaji, Kozue Umeda
• Keywords: ACNS 2004, Cryptology, Group Signature, Group Signature Scheme, Membership Certificates