车联网中格上基于身份的隐私保护协议

Identity-based privacy protection protocol from lattices in VANET

为了解决车载自组织网络(vehicular ad hoc network, VANET)上的通信协议可能存在的节点冒充、数据伪造、真实身份泄露等问题,同时考虑到现有隐私保护认证协议存在身份管理成本大、协议性能与用户数量呈负相关、签名长度长等不足,提出一种车联网中格上基于身份的隐私保护协议。通过数字签名实现身份认证和数据鉴别,基于环上容错学习(ring learning with errors, RLWE)困难问题对用户身份进行匿名化保护,基于小整数解(small integer solution, SIS)困难问题和拒绝采样技术对消息进行数字签名认证。理论分析证明,提出的协议具有抗量子攻击的特性,满足车联网中的安全需求,在提高计算和通信效率的同时减小了签名长度。仿真结果表明,提出的协议性能满足国内车联网通信相关指标要求。

In order to solve the problems of node impersonation,data forgery,or identity leakage that may exist in the communication protocols on the vehicular ad hoc network(VANET),and considering the shortcomings of existing privacy protection authentication protocols,such as identity management cost,negative correlation between protocol performance and the number of users,and long signature length,this paper proposes an identity-based privacy-protection protocol from lattice in VANET.The protocol realized identity authentication and data authentication through digital signature algorithm.Based on the Ring Learning With Errors(RLWE)problem,the user identity was anonymous and protected,and the message was digitally signed and authenticated by the Small Integer Solution(SIS)problem and the rejection sampling technique.The protocol has been theoretically proved to resist quantum attacks,fulfilling security requirements in the VANET,while improving computational and communication efficiency and reducing signature length.Simulation results indicate that the protocol performance meets the relevant requirements for communication in domestic vehicular networks.