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| Cryptanalysis and Improvement of a New Proxy Signature Scheme |
| Lu Rong-bo①②; He Da-ke②; Wang Chang-ji③; Miao Xiang-hua② |
| ①College of Mathematics and Computer Science, Jishou University, Jishou 416000, China; ②Lab. of Information Security and National Computing Gird, Southwest Jiaotong University, Chengdu 610031, China; ③Department of Computer Science, Sun Yat-Sen University, Guangzhou 510275, China |
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Abstract The proxy signature with proxy signer privacy protection without a trusted third party put forward by Gu-Zhang-yang(2005), does not posses the strong unforgeability property because of not being able to avoid the suspending-factor. With this scheme, the original signer can forge a valid proxy signature and pass the procedure of verification and revelation, therefore he or she can successfully prove it is signed by a legal proxy signer. To avoid this shortcoming, an improvement of a proxy signature scheme with proxy signer privacy protection is proposed based on the analysis of the Gu-Zhang-yang’s scheme.
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Received: 03 April 2006
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2007, Vol. 29 
