Cryptology ePrint Archive: Report 2004/096

On the Ambiguity of Concurrent Signatures

Yi Mu and Fangguo Zhang and Willy Susilo

Abstract: We point out that the notion of {\em ambiguity} introduced in the concurrent signatures proposed by Chen, Kudla, and Paterson in Eurocrypt 2004 is incorrect. Any third party who observed two signatures can differentiate who has/have produced the signatures by performing the verification algorithm. We note that the model proposed in the paper is sound, but the concrete scheme does not really provide what is required in the model.

Category / Keywords: cryptographic protocols /

Date: received 18 Apr 2004, last revised 26 Apr 2004, withdrawn 4 May 2004

Contact author: ymu at uow edu au

Available format(s): (-- withdrawn --)

Note: The paper by Chen, Kudla, and Paterson can be downloaded from the Springer website

Version: 20040505:064824 (All versions of this report)

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