摘要： 车载自组织网络（VANET）普遍存在通信数据易被攻击和计算效率低等问题。为此，以无证书公钥密码体制和聚合签名为基础，提出一种隐私保护的无证书聚合签名方案。签名方案在随机预言模型下抵抗2种不同类型的敌手攻击，以在适应性选择消息攻击下证明通信消息的不可伪造性，车辆节点根据可信机构生成的伪身份进行通信来实现用户通信的可追踪性和匿名性，并在双线性对运算的基础上通过聚合签名支持多个消息的聚合验证。仿真结果表明，与同类无证书聚合签名方案相比，该方案在车流量较大路段具有较高的通信效率，可实现城市道路VANET通信过程中的车辆用户隐私信息保护。

关键词: 车载自组织网络, 无证书密码体制, 聚合签名, 双线性映射, 隐私保护

Abstract: In Vehicular Ad-hoc Network(VANET),problems such as vulnerable communication data and low computational efficiency are ubiquitous.This paper proposes a certificateless aggregation signature scheme based on certificateless public key cryptosystem and aggregation signature.The proposed scheme can resist two different types of adversary attacks under the random oracle model.Besides,it can further prove the unforgeability of communication messages under the adaptive chosen message attack.Moreover,the vehicle nodes can communicate through pseudo-identities generated by trusted authorities,thus achieving the traceability and anonymity of user communication.On the basis of bilinear pairing operations,the proposed scheme can support aggregation verification of multiple messages by aggregation signature.Simulation results show that compared with other certificateless aggregation signature schemes,the proposed scheme has higher communication efficiency in the large traffic flow section,and it can effectively achieve the privacy protection of vehicle users during VANET communication on urban roads.

Key words: Vehicular Ad-hoc Network(VANET), certificateless cryptography, aggregate signature, bilinear mapping, privacy protection

中图分类号: 

• TP309