An improved signature scheme without using one-way Hash functions

  title={An improved signature scheme without using one-way Hash functions},
  author={Jianhong Zhang and Yumin Wang},
  journal={Applied Mathematics and Computation},
Recently, Chang et al. give a digital signature scheme, where neither one-way hash function nor message redundancy schemes are used, but Zhang et al. has shown that the scheme was forgeable, namely, any one can forge a new signature by the signer s signature, and give two forgery attacks. To the above attacks, we give an improved signature scheme based on Chang signature scheme and analyze the security of the improved scheme. 2005 Elsevier Inc. All rights reserved. 

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