VANETs中基于环签密和非交互式零知识证明的条件隐私保护方案

Conditional privacy protection scheme based on ring signcryption and non-interactive zero-knowledge proof in VANETs

针对车载自组织网络(VANETs)中现有环签名方案易陷入单点失败和追踪非法用户真实身份困难问题,提出了一种基于环签密和非交互式零知识证明的条件隐私保护方案。选用环签密方法来同时实现匿名认证和传递消息加密,采用分布式门限密钥生成方法来防止单点失败问题,利用非交互式零知识证明技术在环签密中增加追踪标签,使监管权威在必要时可以快速追踪用户的真实身份,实现了条件隐私保护的目标。与现有的几种环签密方案相比,本方案可以同时实现匿名性、机密性、可认证性、去中心化、防伪造性、不可链接性、可追踪性等安全性能。随着环成员数的增大,本方案在通信开销和计算开销两方面都表现出明显优势。

In order to solve the problem that existing ring signature schemes in Vehicle Ad Hoc Networks(VANETs)are prone to fall into the single-point failure and difficult to trace the real identity of illegal users,a conditional privacy protection scheme based on the ring signcryption and non-interactive zero-knowledge proof is proposed.The ring signcryption method is used to realize anonymous authentication and message encryption at the same time.The distributed threshold key generation method is used to prevent the single-point failure problem,and the non-interactive zero-knowledge proof technology to add the tracking label in the ring signcryption,so that the trace authority can quickly track the real identity of the user when necessary,and can achieve the goal of conditional privacy protection.Compared with several existing ring signcryption schemes,this scheme can achieve anonymity,confidentiality,authentication,decentralization,anti-counterfeiting,unlinkability,traceability and so on simultaneously.With the increase of the number of ring members,the proposed scheme has obvious advantages in both communication overhead and computation cost.