Cryptanalysis of the Hwang-Shi Proxy Signature Scheme

Authors:
Min-Shiang Hwang;Cheng-Ch Lee;Shin-Jia Hwang
Affiliations:
Department of Information Management, and Graduate Institute of Networking and Communication Engineering, Chaoyang University of Technology, 168 Gifeng E. Rd., Wufeng, Taichung County, Taiwan 413, ...;Department of Computer and Information Science, National Chiao-Tung University, 1001 Ta Hsueh Road, Hsinchu, Taiwan, R.O.C.;Department of Computer Science and Information Engineering, TamKang University, Tamsui, Taipei Hsien,251,Taiwan, R.O.C.
Venue:
Fundamenta Informaticae
Year:
2002

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Abstract

Recently, Hwang and Shi proposed an efficient proxy signature scheme without using one-way hash functions. In their scheme, an original signer needn't send a proxy certificate to a proxy signer through secure channels. However, there are two public key substitution methods that can be used to attack their scheme. In this article, we show that their scheme is vulnerable to the public key substitution attacks.