关键词: 部分盲签名, 基于身份, 安全模型, 不可伪造性, 双线性映射

Abstract: Recently, an efficient identity-based partially blind signature scheme was put forward by Cui and Xin et al. First of all, it was pointed out that Cui-Xin's scheme suffered from the forgery attack in which a requester could change the pre-agreed common information illegally, and the reason why Cui-Xin's scheme could not resist the forgery attack was discussed. Secondly, an improved scheme was put forth to overcome the security flaw of Cui-Xin's scheme, and it was strictly proved to be unforgeable. Compared with the existing schemes, the results show that the proposed scheme is an efficient identity-based partially blind signature scheme.

Key words: partially signature, identity-based, security model, unforgebility, bilinear map