一个前向安全盲签名方案的分析与改进  

Cryptanalysis and Improvement of a Forward-Secure Blind Signature Scheme

作　　者：孙芳[1] 张雪峰[2] 袁小转[3] 

机构地区：[1]信阳师范学院计算机与信息技术学院,河南信阳464000 [2]信阳农林学院计算机科学系,河南信阳464000 [3]信阳师范学院数学与信息科学学院,河南信阳464000

出　　处：《信阳师范学院学报（自然科学版）》2014年第3期444-446,共3页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(61272465);河南省自然科学基金项目(122400550189;142300410320;142400410486)

摘　　要：对何俊杰等人提出的基于二次剩余的前向安全盲签名方案进行安全性分析,指出方案不满足前向安全性,并提出了一种改进方案.分析结果表明,在二次剩余的平方根计算和2l次根计算困难的假设下,改进方案具有前向安全性;其不可伪造性则依赖于离散对数难题和二次剩余的2l次根计算难题.Cryptanalysis of the forward-secure blind signature scheme proposed by He Junjie et al. showed that the scheme does not satisfy forward security. An improved forward-secure blind signature scheme was proposed. Analysis results showed that the improved scheme has forward security under the assumption which make solving the square root and 2t -th root of a quadratic residue hard, and its unforgeability dependends on the hardness of discrete logarithm problems and the problems of computing 2t -th root of a quadratic residue.

关 键 词：盲签名 前向安全性 二次剩余 离散对数 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]