一种新的隐私保护型车载网络切换认证协议

该文针对现有车载网络切换认证协议存在的安全性、隐私等方面的不足，在LIAP协议的基础上提出改进方案。首先将随机数与伪标识串联，再用二次模运算对串联的信息进行加密，以生成动态身份标识保护用户位置隐私；与此同时，在移动终端切换过程中，新路侧单元重新生成新会话秘密序列，并与终端伪标识进行异或加密，对LIAP协议中存在的平行会话攻击进行安全防护。理论分析及实验表明，改进协议不仅满足终端匿名性和抵御各种攻击的安全需求，也实现了较快的切换速度，与同类切换认证协议相比，实用中具明显优越性。

Improved Privacy Protection Handover Authentication Protocol for Vehicular Ad Hoc Networks

To overcome the shortages in security and privacy of existing handover authentication protocols for vehicle network, an improved scheme based on the Lightweight Identity Authentication Protocol (LIAP) protocol is proposed in this paper. Firstly, terminals pseudo-identity is concatenated with a random number, then quadratic residues operation is utilized to encrypt the connected information and to generate a dynamic identity, which can protect the users location privacy. Meanwhile, the new road side unit regenerates a new session secret sequence and computes the challenge sequence with the terminal users pseudo-identity by XOR encryption, which can provide secure protection against parallel session attack during the handover process. Theoretical analysis and experiments show that the proposed protocol can not only meet security requirements of providing terminal anonymity and defending various attacks, but also achieve a faster switching speed. Therefore, the improved protocol shows obvious superiorities over most existing schemes.