A Signature Protocol Based on Specific Set

Based on the idea of privilege set, this paper proposes a threshold group signature scheme with multiple privilege sets. Only when the joint involvement of ordinary users under satisfied conditions and privileged users with multiple privilege sets can the valid proxy group signature be generated. Some members can’s forge signatures, which can help resist attacks. The threshold signature scheme has good features of privilege sets and threshold characteristics, unforgeability of signature and anonymity of verification and traceability of identity.