Vehicular ad-hoc network (VANET) has been considered as one of the most promising wireless sensor technologies, which could enhance driving convenience and traffic efficiency through real-time information interaction. Nevertheless, emerging security issues (e.g., confidentiality, integrity, identity privacy, message authentication) will hinder the widespread deployment of VANETs. To address these issues, in this paper, we propose an efficient privacy-preserving anonymous authentication protocol for VANETs. We first design an identity-based signature algorithm, and exploit it with an account information of a vehicle to propose our anonymous authentication protocol. The protocol enables each vehicle to anonymously send an authenticated message to nearby roadside units (RSUs) in a confidential way, and efficiently check the feedback information from nearby RSUs. Simultaneously, the protocol achieves key-exchange functionality, which could produce a session key for later secure communication between vehicles and RSUs. Finally, we give the security analysis of the proposed protocol and conduct a comprehensive performance evaluation, the results demonstrate its feasibility in the secure deployment of VANETs.

车载自组织网络（VANET）被认为是最有前途的无线传感器技术之一，它可以通过实时信息交互来提高驾驶便利性和交通效率。然而，新出现的安全问题（例如，机密性、完整性、身份隐私、消息认证）将阻碍 VANET 的广泛部署。为了解决这些问题，在本文中，我们为 VANET 提出了一种有效的隐私保护匿名身份验证协议。我们首先设计了一种基于身份的签名算法，并将其与车辆的帐户信息结合起来，提出了我们的匿名身份验证协议。该协议使每辆车都能以保密的方式匿名向附近的路边单位 (RSU) 发送经过身份验证的消息，并有效地检查来自附近 RSU 的反馈信息。同时，该协议实现了密钥交换功能，可以为车辆和 RSU 之间的后续安全通信生成会话密钥。最后，我们对所提出的协议进行了安全分析并进行了全面的性能评估，结果证明了其在 VANETs 安全部署中的可行性。