一个无证书部分盲签名方案的分析与改进

通过对何俊杰等提出的一个无证书部分盲签名方案进行安全性分析,发现方案存在公共信息被用户非法篡改的问题.为了保证公共信息的不被篡改,提出了一种基于k-CAA问题和ICDH问题改进的无证书部分盲签名方案.随后对协议的正确性、部分盲性、安全性进行分析,且在随机预言机模型下证明了新方案对两类攻击者的适应性选择消息攻击是存在性不可伪造的.

Cryptanalysis and Improvement of One Certificateless Partially Blind Signature Scheme

The security of a certificateless partially blind signature scheme put forward by He Junjie et al was analyzed,it was found that there was a common information tampered illegally by a user problem.In order to ensure that common information is not tampered,an improved certificateless partially blind signature scheme based on the collusion attack algorithm with k-traitors(k-CAA)and inverse computational Diffie-Hellman(ICDH)problem was proposed,and then its correctness,partially blind and security were analyzed.The new scheme was proved to be existentially unforgeable for the adaptive chosen message and the attacks from two kinds of adversaries in random oracle model.