新的基于变色龙的车载通信安全与隐私保护

在车载自组网（VANET）中许多服务和应用需要保护数据通信的安全，为提高驾驶的安全性和舒适性，一些与交通状况有关的信息就要被周期性地广播并分享给司机，如果用户的身份和信息没有隐私和安全的保证，攻击者就会通过收集和分析交通信息追踪他们感兴趣的车辆，因此，匿名消息身份验证是VANET中不可或缺的要求。另一方面,当车辆参与纠纷事件时，证书颁发机构能够恢复车辆的真实身份。为解决车载通信这一问题，郭等人在传统方案的基础上提出一种基于椭圆曲线的变色龙散列的隐私保护验证协议。虽然此方案较之前方案具有车辆身份可追踪性和高效率性，但分析表明此方案不满足匿名性。对郭等人的方案进行安全性分析并在此基础上做出改进。

New chameleon Hashing of secure and privacy-preserving vehicular communications

Many services and applications in vehicular ad-hoc networks (VANET) require preserving and secure data communications.To improve driving safety and comfort,the traffic-related status information will be broadcasted regularly and shared among drivers.Without the security and privacy guarantee,attackers could track their interested vehicles by collecting and analyzing their traffic messages.Hence,anonymous message authentication is an essential requirement of VANET.On the other hand,when a vehicle is involved in a dispute event of warning message,the certificate authority should be able to recover the real identity of this vehicle.To deal with this issue,Guo,et al proposed a new privacy-preserving authentication protocol with authority traceability using elliptic curve based chameleon Hashing.Although this scheme has vehicle identification traceability and high computational efficiency than the previous plan,but analysis shows that the scheme does not meet the anonymity.The security of Guo's scheme is analyzed and improvement is made based on Guo’s protocol.