Cryptology ePrint Archive: Report 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.
Category / Keywords: public-key cryptography / digital signature, group signature, cryptanalysis.
Publication Info: Techical Report.
Date: received 27 Sep 2003, last revised 29 Dec 2003
Contact author: glwang at i2r a-star edu sg
Available formats: Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation
Version: 20031229:091635 (All versions of this report)
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