Research note: Threshold signature schemes with traceable signers in group communications

Authors:
Ching-Te Wang;Chu-Hsing Lin;Chin-Chen Chang
Affiliations:
Institute of Computer Science and Information Engineering, National Chung Cheng University, Chiayi, Taiwan 62107, People's Republic of China;Department of Computer and Information Sciences, Tunghai University, Taichung, Taiwan 407, People's Republic of China;Institute of Computer Science and Information Engineering, National Chung Cheng University, Chiayi, Taiwan 62107, People's Republic of China
Venue:
Computer Communications
Year:
1998

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Abstract

We propose a new group-oriented (t,n) threshold signature scheme that can withstand conspiracy attacks without attaching a secret number. The group's public key is determined by all members, each member signs a message independently and transmits the individual signature to a designated clerk who checks and integrates them into a group signature. A verifier can authenticate the group signature and trace back to find the signers. Further, we develop another threshold signature scheme without a trusted center. The proposed schemes possess all of the characteristics listed in Harn's scheme and are more difficult to break.