Cryptology ePrint Archive: Report 2005/178

Analyzing Unlinkability of Some Group Signatures

Zhou Sujing and Lin Dongdai

Abstract: Miyaji et.al proposed a fully functional(i.e., satisfying unforgeability, exculpability,anonymity, traceability, unlinkability, and revocability.) group signature over only known-order groups, that is based only on Discrete logarithm related assumptions, specifically, multiple DLP they proposed in the same paper [MU04]. In this paper, we point out their scheme and an improved scheme [ZZW05] do not have unlinkability.

Category / Keywords: Digital Signature, Group Signature.

Date: received 14 Jun 2005, last revised 8 Sep 2005

Contact author: zhousujing at is iscas ac cn

Available format(s): PDF | BibTeX Citation

Note: Correct some errors and add in some new information.

Version: 20050908:100219 (All versions of this report)

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