Cryptanalysis of proxy blind signature scheme
一个代理盲签名方案的安全性分析

Cryptanalysis of the proxy blind signature scheme based on DLP which was proposed by Liu et al. showed that the scheme didn't satisfy strongly unforgeability and unlinkability. This paper proposed an improved scheme to overcome these security problems. By using authorized certificate in the stage of proxy designation, it effectively resisted the original signer's forgery attacks; by increaseing the number of blind elements in the stage of blind signing, it satisfied the unlinkability of the new shceme. Analysis result shows that the new shceme satisfies the requirements of proxy blind signature scheme and has high calculating efficiency.