ACJT群签名方案中一种新的成员撤销方案

New Membership Revocation Scheme in ACJT Group Signature

在ACJT群签名方案的基础上,提出一个新的成员撤销方案。新方案中群公钥的大小仅取决于群中成员的个数,不会随着撤销成员的增加而无限增大。增加或撤销一个成员,群管理者只需作乘法或除法运算来更新群公钥,签名和验证过程更简单,而且证明了新方案的安全性。

A new membership revocation method based on the ACJT group scheme was provided. In this new scheme, the size of public key only lay on the number of members in the group, and would not increase infinitely along with the increase of number of members which were revoked. It needed only a multiplication or division to update the public key for the group manager to add or exclude a group member. The signing and verifying procedure were simpler than previous ones. The security of the new scheme was proved.