中文摘要：

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.

英文摘要：

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.