Cryptology ePrint Archive: Report 2004/213

Cryptanalysis of Chang et al.'s Signature Scheme with Message Recovery

Fangguo Zhang

Abstract: Recently, Chang \textit{et al}. \cite{Chang} proposed a new digital signature scheme with message recovery and claimed that neither one-way hash functions nor message redundancy schemes were employed in their scheme. However, in this letter, two forgery attacks are proposed to show that Chang \textit{et al.}'s signature scheme is not secure. To resist these attacks, the message redundancy schemes may be still used.

Category / Keywords: public-key cryptography / Digital signature with message recovery, message redundancy schemes, Attack

Date: received 29 Aug 2004

Contact author: isdzhfg at zsu edu cn

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Version: 20040830:074128 (All versions of this report)

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