Cryptology ePrint Archive: Report 2005/055

Untraceability of Two Group Signature Schemes

Zhengjun Cao

Abstract: A group signature scheme allows a group member of a given group to sign messages on behalf of the group in an anonymous fashion. In case of a dispute, however, a designated group manager can reveal the signer of a valid group signature. In the paper, we show the untraceability of two group signatures in [1, 5] by new and very simple attacks. Although those flaws, such as, forgeability, untraceability and linkability have been shown in [2, 7, 8, 9], we should point out that our attacks are more simple.

Category / Keywords: cryptographic protocols / Group signature, Untraceability.

Date: received 23 Feb 2005

Contact author: zjcamss at hotmail com

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Version: 20050225:075007 (All versions of this report)

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