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Paper: Security Flaws in Several Group Signatures Proposed by Popescu

Authors:
Guilin Wang
Sihan Qing
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URL: http://eprint.iacr.org/2003/207
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Abstract: In resent years, Popescu proposed several group signature schemes based on the Okamoto-Shiraishi assumption in [8-11], and claimed his schemes are secure. However, this paper demonstrates that all these schemes are insecure by identifying some security flaws. Exploiting these flaws, an attacker without any secret can mount universally forging attacks. That is, anybody (not necessarily a group member) can forge valid group signatures on arbitrary messages of his/her choice.
BibTeX
@misc{eprint-2003-11920,
  title={Security Flaws in Several Group Signatures Proposed by Popescu},
  booktitle={IACR Eprint archive},
  keywords={public-key cryptography / digital signature, group signature, cryptanalysis.},
  url={http://eprint.iacr.org/2003/207},
  note={Techical Report. glwang@i2r.a-star.edu.sg 12415 received 27 Sep 2003, last revised 29 Dec 2003},
  author={Guilin Wang and Sihan Qing},
  year=2003
}