一种基于身份的高效短群签名方案

使用子群判定假设，利用以身份层次化为基础的群签名构造方法，提出一种基于身份的高效短群签名方案。在无需更新群公钥和其他群成员签名私钥的前提下，允许新成员的动态加入，群签名长度不依赖于群成员的数目，群管理员不能伪造其他成员的签名。实验结果表明，在遭受选择明文攻击时，该方案能满足匿名性、防伪造性、可追踪性和防陷害性等安全需求，并具有较高的运行效率和较短的签名长度。

Identity-based Efficient Short Group Signature Scheme

This paper using the subgroup decision assumption proposes an identity-based efficient short group signature scheme by using the hierarchical identity-based group signature construction method.It allows new members to join in the group dynamically without updating the group public key and other group members＇ private signing keys.The length of the signature is independent of the amount of the group members,and the group manager can not forge any other member＇s signature.Experimental results show that,this scheme satisfies anonymity,unforgeability,traceability and non-frameability of the security requirements of group signature under Chosen Plaintext Attacks（CPA）.This scheme is more efficient and the length of the signature is shorter.