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 format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation

Version: 20031229:091635 (All versions of this report)

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