Vehicular ad-hoc network (VANET) has been gaining importance due to the fast growing technology as well as its requirements in intelligent transportation systems (ITS) and vehicular social network (VSN). VANET facilitates vehicle to vehicle (V2V) and vehicle to infrastructure (V2I) communication and improves the ride quality with value added services. The number of connected vehicles is expected to grow to a huge number with enormous exchange of safety and non-safety messages which are susceptible to security and privacy threat. To ensure secured communication, VANET must implement an authentication protocol to resist the attack and preserve the privacy. In this paper, a detailed discussion on the taxonomy for authentication schemes in VANET has been presented. The authentication schemes have been compared with security, privacy and scalability requirement. The use of recent technologies such as 5G, 5G-SDN, and Blockchain to design authentication schemes with low cost, and low communication, computational overhead has been discussed. Finally, the paper concludes with open challenges in VANET authentication. This paper is expected to open new avenues for researchers working in the domain of VANETs.

中文翻译：

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车载Ad-Hoc网络中的认证方案的全面综述

由于快速发展的技术及其在智能交通系统（ITS）和车辆社交网络（VSN）中的要求，车载自组织网络（VANET）变得越来越重要。VANET促进了车辆对车辆（V2V）和车辆对基础设施（V2I）的通信，并通过增值服务提高了乘车质量。随着易受安全性和隐私威胁影响的安全和非安全消息的大量交换，联网车辆的数量预计将增长到巨大的数量。为了确保安全的通信，VANET必须实施身份验证协议以抵御攻击并保护隐私。在本文中，对VANET中认证方案的分类法进行了详细讨论。验证方案已与安全性进行了比较，隐私和可伸缩性要求。已经讨论了使用最新技术（例如5G，5G-SDN和Blockchain）来设计具有低成本，低通信量和计算开销的身份验证方案。最后，本文以VANET身份验证面临的开放挑战作为结尾。预期本文将为在VANET领域工作的研究人员开辟新的途径。