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Cryptanalysis of Chang et al.'s signature scheme with message recovery

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1 Author(s)
Fangguo Zhang ; Dept. of Electron. & Commun. Eng., Sun Yat-sen Univ., Guangzhou, China

Recently, Chang et al., (2004) 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 et al.'s signature scheme is not secure. To resist these attacks, the message redundancy schemes may still be used.

Published in:

Communications Letters, IEEE  (Volume:9 ,  Issue: 4 )