Analysis on a Non-repudiable Threshold Proxy Signature Scheme with Known Signers

Authors:
Gang Li;Yanling Li;Chuanda Qi
Affiliations:
College of Computer and Information Technology, Xinyang Normal University, Xinyang, China 464000;College of Computer and Information Technology, Xinyang Normal University, Xinyang, China 464000;College of Mathematics and Information Science, Xinyang Normal University, Xinyang, China 464000
Venue:
ISNN 2009 Proceedings of the 6th International Symposium on Neural Networks: Advances in Neural Networks - Part II
Year:
2009

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Abstract

In 2000, Hwang et al. made an improvement on Sun's threshold proxy signature scheme. In 2004, Tzeng et al. present that Hwang et al.'s scheme is vulnerable against attack. A malicious original signer can forge the threshold proxy signatures without the agreement of the proxy signers. Tzeng et al. also constructed a nonrepudiable threshold proxy signature scheme with known signers and claimed the proposed scheme improved the security of Hwang et al.'s scheme. In this paper, we pointed that reasoning in THY-scheme exist severity error. Since it is repaired hardly possible that this reasoning in secret share generation phase of THY-scheme existed error, therefore THY-scheme is not useful even though changed some formulae.