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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2004, Vol. 5 Issue (1): 50-54    DOI: 10.1631/jzus.2004.0050
Computer & Information Science     
Verifiable threshold signature schemes against conspiracy attack
GAN Yuan-ju
College of Information Science and Engineering, Central South University, Changsha 410075, China
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Abstract  In this study, the author has designed new verifiable (t,n) threshold untraceable signature schemes. The proposed schemes have the following properties: (1) Verification: The shadows of the secret distributed by the trusted center can be verified by all of the participants; (2) Security: Even if the number of the dishonest member is over the value of the threshold, they cannot get the system secret parameters, such as the group secret key, and forge other member\'s individual signature; (3) Efficient verification: The verifier can verify the group signature easily and the verification time of the group signature is equivalent to that of an individual signature; (4) Untraceability: The signers of the group signature cannot be traced.

Key words： Cryptography      Threshold group signature      Conspiracy attack      Forgery attack     
Received: 30 March 2003     
CLC:  TP309  
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GAN Yuan-ju
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GAN Yuan-ju. Verifiable threshold signature schemes against conspiracy attack. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2004, 5(1): 50-54.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2004.0050     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2004/V5/I1/50

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