安全无可信私钥生成中心的部分盲签名方案

Secure Partially Blind Signature Scheme without Trusted PKG

目前基于身份的部分盲签名方案或者安全性不高,或者效率较低。针对这些方案的缺陷,通过密码学分析和算法结构设计,提出了一个新的基于身份的无可信私钥生成中心(Private Key Generator,PKG)的、只有一个对运算的部分盲签名方案。证明了方案的强盲性,证明了该方案可以抵抗适应性选择消息和身份攻击,可以抵抗不可信PKG的攻击,其安全性依赖于强l-SDHP难题。比较了方案和其他类似方案的效率。

Current identity-based partially blind signature scheme or the security is not high, or less efficient. Aiming at the defect, through analysis for cryptography and algorithm design, the paper presents an new D-based partially blind signature scheme with only one bilinear pairing without trusted Private Key Generator （PKG）. The proposed scheme has been proved to be strong blindness and be secure against existential forgery on adaptively chosen message and ID attack, and against attack from un-trusted PKG and be more efficient. Its security relies on the hardness of 1-Strong Diffie-Hellman problem （1-SDHP）. The difference of the scheme with other likely schemes has been done.