对一种新型代理签名方案分析与改进之评论

Comment on the Cryptanalysis and Improvement of a New Proxy signature Scheme

2006年鲁荣波在其博士论文"代理数字签名和群数字签名的分析与设计"中对一种新型代理签名方案进行了分析与改进,该方案改进自谷利泽等人于2005年所提出的代理签名方案,鲁氏强化了谷氏在不可伪造性上的弱点,并且回避了孤悬因子所产生的弱点安全问题。然而鲁氏在改进的方案中,误用参数及给了错误的计算方法,因此在推导的过程也就得到错误的结果。本论文指出错误之处,并给出正确算法,使其理论完善。

In 2006,Lu proposed an analysis and design of proxy signature with group signature in his dissertation based on the cryptanalysis and improvement of a new proxy signature scheme.This scheme improved from Gu et al.＇s method who proposed a new proxy signature scheme in 2005.He strongly revised the denial of vulnerability problem based on Gu et al.＇s,and also solved the suspending factor issues.However he misused parameters and calculated the wrong result.He therefore obtained a incorrect solution.In this paper,we modified this situation and algorithm where it would be correct and perfect.