对一个高效的基于身份的代理盲签名方案的分析和改进

摘要

The paper analyzes the security of the identity-based proxy blind signature scheme with untrusted Private Key Generation (PKG) proposed by the scholar Nongqiang and points out that the scheme does not satisfy the property of unforgeability and there exist some security drawbacks such as proxy signer stealing the private of original signer and common user forging signature. Aiming at the existing problems of the scheme, a novel proxy blind signature scheme with untrusted PKG is proposed, and its correctness and security are analyzed%对一个基于身份的无可信私钥键生成中心(PKG)的代理盲签名方案进行了安全性分析,指出该方案不满足不可伪造性,并且存在着代理签名人可以窃取原始签名人私钥,以及普通用户伪造签名等安全缺陷.针对该方案存在的问题,本文提出了一个新的无可信PKG的代理盲签名方案,并对新方案的正确性和安全性进行了分析.