一个部分盲签名方案的分析与改进

Analysis and improvement of a partial blind signature scheme

在部分盲签名中签名者可在签名中加入公共信息,在保护用户个人隐私的同时防止了签名被滥用。通过对一个部分盲签名方案进行安全性分析,发现该方案对篡改公共信息攻击并不安全。在原方案的基础上给出一个新的基于身份的部分盲签名方案,基于双线性映射的逆问题,在随机预言模型下证明了新方案是安全的。与同类型方案进行比较,发现新方案在效率上具有优势。

In a partially blind signature,the signer can add public information to the signature to protect the user’s personal privacy while preventing the signature from being abused.By the security analysis of a proposed partial blind signature scheme,we found that the scheme is not safe for tampering with public information.A new identity-based partial blind signature scheme is given based on the original scheme.Based on the inverse problem of bilinear mapping,the new scheme is proved to be safe under the random oracle model.Compared with the same type of schemes,it is found that the new scheme has an advantage in efficiency.