Automotive cyber physical systems (CPSs) are ever more utilizing wireless technology for V2X communication as a potential way out for challenges regarding collision detection, wire strap up troubles and collision avoidance. However, security is constrained as a result of the energy and performance limitations of modern wireless systems. Accordingly, the need for efficient secret key generation and management mechanism for secured communication among computationally weak wireless devices has motivated the introduction of new authentication protocols. Recently, there has been a great interest in physical layer based secret key generation schemes by utilizing channel reciprocity. Consequently, it is observed that the sequence generated by two communicating parties contain mismatched bits which need to be reconciled by exchanging information over a public channel. This can be an immense security threat as it may let an adversary attain and recover segments of the key in known channel conditions. We proposed Hopper-Blum based physical layer (HB-PL) authentication scheme in which an enhanced physical layer key generation method integrates the Hopper-Blum (HB) authentication protocol. The information collected from the shared channel is used as secret keys for the HB protocol and the mismatched bits are used as the induced noise for learning parity with noise (LPN) problem. The proposed scheme aims to provide a way out for bit reconciliation process without leakage of information over a public channel. Moreover, HB protocol is computationally efficient and simple which helps to reduce the number of exchange messages during the authentication process. We have performed several experiments which show that our proposed design can generate secret keys with improved security strength and high performance in comparison to the current authentication techniques. Our scheme requires less than 55 exchange messages to achieve more than 95% of correct authentication.

汽车网络物理系统（CPS）越来越多地利用无线技术进行V2X通信，以此作为解决碰撞检测，电线束扎故障和避免碰撞的挑战的潜在出路。但是，由于现代无线系统的能量和性能限制，安全性受到了限制。因此，对于用于计算能力较弱的无线设备之间的安全通信的有效秘密密钥生成和管理机制的需求促使了新认证协议的引入。最近，通过利用信道互易性，对基于物理层的秘密密钥生成方案引起了极大的兴趣。所以，可以看出，由两个通信方生成的序列包含不匹配的位，需要通过在公共信道上交换信息来对其进行协调。这可能是一个巨大的安全威胁，因为它可能会让对手在已知的通道条件下获得并恢复密钥的各个部分。我们提出了一种基于Hopper-Blum的物理层（HB-PL）身份验证方案，其中增强的物理层密钥生成方法集成了Hopper-Blum（HB）身份验证协议。从共享信道收集的信息用作HB协议的秘密密钥，不匹配的位用作感应噪声，以学习带有噪声的奇偶校验（LPN）问题。所提出的方案旨在为比特协调过程提供一种出路，而不会在公共信道上泄漏信息。此外，HB协议计算高效且简单，有助于减少身份验证过程中交换消息的数量。我们进行了一些实验，这些实验表明，与当前的身份验证技术相比，我们提出的设计可以生成具有提高的安全强度和高性能的秘密密钥。我们的方案需要少于55条交换消息才能实现95％以上的正确身份验证。