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Proceedings of 2009 International Workshop on Information Security and Application (IWISA 2009)

Qingdao, China, November 21-22, 2009

Editors: Feng Gao and Xijun Zhu

AP Catalog Number: AP-PROC-CS-09CN004

ISBN: 978-952-5726-06-0

Page(s): 116-119

Improvement on Huang et al.'s Novel Efficient Threshold Proxy Signature Scheme

Jiang-hong Hu, Mei-juan Huang, and Jian-zhong Zhang

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In 2006, Hui-Feng Huang and Chin-Chen Chang proposed a novel efficient threshold proxy signature scheme based on Schnorr's scheme. In their scheme, the original signer could know who generated the threshold proxy signature and the receiver could certify the actuality of the proxy group signers who made the proxy signature. However, their scheme had some security weaknesses. In this paper, by identifying some concrete instances and analyzes, we demonstrate that their scheme is vulnerable to the forgery attack and the public-key substitute attack. That is, Huang et al.'s scheme could not achieve their claimed security requirement. Finally, we propose our improvement to eliminate the weaknesses and give its security analysis.

Index Terms

Morphology, PIC, Background reconstruction, Three frame difference

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