面向授权集的动态群签名方案

Dynamic Group Signature Scheme Respecting Authorized Subgroup

群成员密钥泄露问题一直是群签名安全的最大威胁。随着动态群的提出,这一问题也逐渐被规范化,即如何实现群成员的完美撤销和签名的向前安全。文章针对一种特殊的应用环境提出了一个满足上述安全需求的方案。此外,方案利用授权集实现了可信度的分发,进一步增强了签名的安全性。签名方案是基于Rabin难题和双线性对,对于大群体而言依然是高效的。

The exposition of some group members＇ secret signing keys is still threatening the security of group signature. The problem was formulated along with the proposal of the dynamic group, namely how to achieve perfect revocation and forward security. This paper proposed a scheme satisfying the above security requirement for certain environment. Besides, the security is further enhanced by distributing the trustworthiness in the authorized subgroup. The scheme based on Rabindifficult problem and bilinear pairing is still efficient for large group.