一种基于身份的群盲签名方案

基于身份和盲签名是当代密码学领域两个重要的概念,基于身份用来简化基于证书的公钥环境中的密钥管理;盲签名在实际应用中起着保护消息发送方隐私权的重要作用。本文将Paterson基于椭圆曲线的基于身份的签名方法与盲签名技术结合而提出一个新的基于身份的盲签名方案,并利用已有的转换方法,把我们提出的盲签名方案转换成一个群盲签名方案。分析表明,新的方案满足不可伪造性、匿名性、可追踪性及不可陷害性等安全特性;更重要的是,该群签名以及群公开密钥的长度都与群成员的个数无关,因此更适合群成员较多的大群。

An Identity-Based Group Blind Signature Scheme

Identity-based signature and blind signature are two important concepts in the current cryptology. The identity-based scheme simplifies the key management in the certificate-based public key systems,and in practical applications.Blind signature plays an important role in the protection of the message sender's privacy.This paper presents a blind signature scheme based on the current identity-based signature,and then converts it to a group blind signature by the current convertsion method. Analysis shows that the new scheme meets the demands of unforgeability,anonymity,traceability and no-framing features,etc. Due to the independence between the group public key with the length of signature and the number of group members.This new scheme is suitable for large groups which contain a large number of members.