Security Flaws in Several Group Signatures Proposed by Popescu

Guilin Wang; Sihan Qing

Paper 2003/207

Security Flaws in Several Group Signatures Proposed by Popescu

Guilin Wang and Sihan Qing

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.

Metadata

Available format(s): PDF PS
Category: Public-key cryptography
Publication info: Published elsewhere. Techical Report.
Keywords: digital signature group signature cryptanalysis.
Contact author(s): glwang @ i2r a-star edu sg
History: 2003-12-29: last of 4 revisions; 2003-09-29: received; See all versions
Short URL: https://ia.cr/2003/207
License: CC BY

BibTeX

@misc{cryptoeprint:2003/207,
      author = {Guilin Wang and Sihan Qing},
      title = {Security Flaws in Several Group Signatures Proposed by Popescu},
      howpublished = {Cryptology {ePrint} Archive, Paper 2003/207},
      year = {2003},
      url = {https://eprint.iacr.org/2003/207}
}