对一种新型盲签名方案的分析与改进

对一种盲签名方案进行安全性分析, 发现其不能抵抗无证书签名方案中的公钥替换攻击, 即敌手可通过替换用户的公钥来伪造签名, 并给出了具体的攻击方法。针对这种攻击和结合盲签名方案的构造方法、盲因子的选取方法, 提出了一种改进的方案, 并对新方案进行了盲性、不可链接性、不可伪造性和效率分析。分析表明新方案具有更好的安全性和更高的效率。

Analysis and improvement of new blind signature scheme

This paper analyzed the security of a blind signature scheme and showed that it was insecure against the public key replacement attack in certificateless cryptosystems, the adversary could replace the users' public key to forge the signature and presented the forgery attack method . Based on this attack and combined with the constructor of blind signature and the selection methods of blind factor, this paper gave an improved scheme and analyzed the blindness, unlinkability, non-forgery and efficiency The results show that the new scheme is more secure and efficient.