Improved Non-Repudiable Threshold Proxy Signature Scheme with Known Signers

Authors:
Chwei-Shyong Tsai;Shiang-Feng Tzeng;Min-Shiang Hwang_aff1n3
Affiliations:
Department of Information Management, National Taichung Institute of Technology, 129 Sec. 3, San-min Rd., Taichung, Taiwan 404, ROC;af1 Department of Information Management, Chaoyang University of Technology, 168, Gifeng E. Rd., Wufeng, Taichung County, Taiwan 413, ROC, e-mail: mshwang@mail.cyut.edu.tw;af3 Department of Management Information Systems, National Chung Hsing University, 250, Kuo Kuang Road, Taichung, Taiwan 402, ROC
Venue:
Informatica
Year:
2003

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Abstract

In 2001, Hsu et al. proposed a non-repudiable threshold proxy signature with known signers. In their scheme, the proxy group cannot deny having signed the proxy signature if they did. However, Hsu et al.'s scheme is vulnerable to some attacks. A malicious original signer or malicious proxy signer can impersonate some other proxy signers to generate proxy signatures. In this article, we shall present our cryptanalysis of the Hsu et al.'s scheme. After that, we shall propose a new threshold proxy signature that can overcome the weaknesses.