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Journal of University of Chinese Academy of Sciences ›› 2008, Vol. 25 ›› Issue (5): 698-700.DOI: 10.7523/j.issn.2095-6134.2008.5.019

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Cryptanalysis of a signature scheme without using one-way Hash functions

GUO Li-Feng1, LI Yong1,2,3, HU Lei1   

  1. 1State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences,
    Beijing 100049, China; 2 School of Electronics and Information Engineering,
    Beijing Jiaotong University, Beijing 100044, China; 3 Beijing Municipal Commission of Education, Key Laboratory of Communication & Information Systems, Beijing Jiaotong
    University, Beijing 100044, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-09-15

Abstract: In 2004, Chang, et al. proposed a digital signature scheme without
using one-way hash function and message redundancy schemes. But Zhang
showed that the scheme can be forged. In order to overcome Zhang’s attack, Zhang et al. demonstrated an improved signature scheme based on Chang et al.’s signature scheme and analyzed the security of the improved scheme. But
in this paper, we identify a simple attack to show Zhang, et al.’s scheme is still
not secure. To resist this attack, the hash function and message redundancy
schemes may be still used.

Key words: digital signature, message recovery, redundancy message, Hash
message