# Secure and Efficient High Throughput Medium Access Control for Vehicular Ad-Hoc Network
###### Abstract
In the future, it will arrive at the same time as the implementation of intelligent vehicle interconnection. C - V2X is supported by many mobile operators, major mobile device manufacturers, and automakers, including Audi, BMW, Daimler, Ford, Tesla, and Toyota. Mobile operators, equipment suppliers, and vehicle manufacturers are joining forces to test C - V2X [20; 21]. Though VANET offers tremendous benefits, at the same time, Internet of Vehicles (IoVs) are prone to security attacks. As a result, the security issues must be addressed before practical usage [22]. Therefore, recently, extensive research on network security protocols has been carried considering characteristics such as highly dynamic and self-organizing network topology which is applied to IoV. Among them, identity authentication methodology is an effective way to provide data security [23]. Similarly, authentication and key management techniques have been widely studied and applied extensively in other fields such as the Internet of things (IoT), smart grids, mobile cloud computing, etc. [24; 25; 26]. The desired security on such a platform must first guarantee message integrity. Secondly, to prevent impersonation attacks, the data sender must be authenticated. In addition, user privacy [7; 27] concerns must be taken care of, where the position, identity, and movement of a particular user must not be accessible to any third party. However, in VANET, it is not desired to have such an unconditional privacy-preserving scheme. Since the malicious/intruder vehicles must be tracked and punished in case of any malicious activity carried out. Figure 2: WAVE model. The authentication scheme can be broadly classified into the following three categories: cryptography-based [28; 29], trust-based [30; 31], and hardware-based [32; 33]. In the V2V semi-trust model, organizations involved in protecting privacy are not well suited to deliver high-throughput security applications and smart entertainment applications. To protect the confidentiality of user information, many studies on the state of the art mainly use encryption technology. The encryption technology is mainly based on symmetric or asymmetric encryption keys and decryption. We review the use of secure servers or third-party servers as traditional methods of computing and distributing the key to an authorized organization [34]. The authorities involved in preserving privacy in V2V semi-honest trust model are not suitable for provisioning high throughput safety and smart infotainment application. To preserve the privacy of user data, in literature, many researchers have predominantly adopted cryptography techniques. The cryptography technique relies on the keys for encryption and decryptions, where keys are symmetric or asymmetric. To compute keys and distribute among authorities, a secure or third-party server is considered [35; 36]. The usage of third-party servers incurs the overhead of key computation, storage, and distribution, also known as the initialization phase. Post completion of the initialization phase, the message is secured using cryptography and is shared among vehicles. The design of the proposed Secure Performance Enriched Channel Allocation (S - PECA) model aims to eliminate the need for the local message available with the authorities to be released for provisioning high throughput safety and infotainment application. Firstly, we develop an efficient MAC namely PECA [37] that overcomes the NP\(-\)hard problem [38] of channel sharing in ENCCMA [39] MAC design. Secondly, a security model is designed using commutative RSA, namely, S - PECA. The contributions of this research paper are:  
* RSA cryptography technique with commutative key helps maintain message integrity and privacy. * PECA model (namely key computation, exchange, and distribution using external entities). * PECA model preserves or protects the privacy information in the presence of untrusted or dishonest authorities. * Compared with the existing design, the provision of our design has a much lower security overhead.