Distributed and dynamic threshold group signature scheme

Abstract

A distributed and dynamic threshold group signature scheme without a designated group manager is proposed in this paper. The proposed scheme not only can satisfy the properties of threshold group signature, but also has distributed and dynamic properties, that is, the proposed scheme allows that any t or more group members collaboratively admit prospective members or revoke group members without the group manager. In case of a later dispute, the at least any t or more group members can collectively revoke the anonymity of any threshold group signature and reveal the identity of the signers. Furthermore, the proposed scheme doesn't require any interaction and any costly reliable broadcast communication among sponsoring admission and revocation, moreover the scheme only needs two interaction and broadcast communication among signers in generating threshold group signature. So the scheme is more efficient and has many practical applications in full decentralized and lack central-trusted control environments.