摘要： 提出一个安全有效的无证书群签名方案，满足群签名的各种安全性要求，允许用户动态地加入和离开，并且无需新群公钥和其他群成员的签名私钥，群签名的长度不依赖于群成员的数目。该方案的安全性建立在计算Differ-Hellman问题和逆计算Differ-Hellman问题的困难性的基础上。

关键词: 群签名, 无证书密码体制, 双线性映射, 计算Differ-Hellman问题, 随机预言器

Abstract: This paper propose a secure and efficient certificateless group signature scheme. It not only enjoys all the security requirements of a group signature, but also is a dynamic group signature scheme that allows users to join or leave the group freely without updating the group public key and other group members’ private signing key. The length of the signature is independent of the numbers of the group members. The security of the scheme is based on the fact that Computational Differ-Hellman Problem and inverse computational Differ-Hellman problem are hard.

Key words: group signature, cetificateless cryptography system, bilinear pairing, Computational Differ-Hellman Problem(CDHP), random oracle

中图分类号: 

• TP309.2