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Volume 29 Issue 6
Jan.  2011
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Xie Qi. Cryptanalysis of an Efficient Group Signature Scheme[J]. Journal of Electronics & Information Technology, 2007, 29(6): 1511-1513. doi: 10.3724/SP.J.1146.2005.01046
Citation: Xie Qi. Cryptanalysis of an Efficient Group Signature Scheme[J]. Journal of Electronics & Information Technology, 2007, 29(6): 1511-1513. doi: 10.3724/SP.J.1146.2005.01046

Cryptanalysis of an Efficient Group Signature Scheme

doi: 10.3724/SP.J.1146.2005.01046
  • Received Date: 2005-08-23
  • Rev Recd Date: 2006-06-20
  • Publish Date: 2007-06-19
  • 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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