Abstract
Wang et al have designed a new fuzzy signature scheme based on the discrete logarithm. This scheme has proposed a signature protocol in which the signature can be fairly exchanged between signers. This paper has put forward an improved concurrent signature scheme, which can reduce the numbers of implementing positive protocols and negative protocols when exchange and open the signatures and improve the efficiency of the algorithm. At the same time, the correctness, the non-forgeability and the fairness of the signature can be increased.
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