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| Cryptanalysis of an Efficient Group Signature Scheme |
| Xie Qi |
| School of Information and Engineering, Hangzhou Teachers College, Hangzhou 310036, China |
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Abstract In 2005, Zhang et al. proposed an efficient group signature scheme based on RSA, the total computation cost of signature and verification requires only 9 modular exponentiations. This paper will show that Zhang et al.’s scheme is insecure, any group member colludes with repeal center can generate a valid group signature without using his secret parameters. Additional, it will show that the signer identity verification algorithm is error, identity verification expression is independent of the group signature. That is, the signer identity verification algorithm cannot find who the signer is. Finally, it will show that their scheme is not unlinkable.
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Received: 23 August 2005
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2007, Vol. 29 
