智能车载自组织网络中匿名在线注册与安全认证协议

随着智能交通系统(ITS)的建立，车载自组织网络(VANETs)在提高交通安全和效率方面发挥着重要的作用。由于车载自组织网络具有开放性和脆弱性特点，容易遭受各种安全威胁与攻击，这将阻碍其广泛应用。针对当前车载自组织网络传输中数据的认证性与完整性，以及车辆身份的隐私保护需求，该文提出一种智能车载自组织网络中的匿名在线注册与安全认证协议。协议让智能车辆在公开信道以匿名的方式向交通系统可信中心(TA)在线注册。可信中心证实智能车辆的真实身份后，无需搭建安全信道，在开放网络中颁发用于安全认证的签名私钥。车辆可以匿名发送实时交通信息到附近路边基站单元(RSU)，并得到有效认证与完整性检测。该协议使得可信中心可以有效追踪因发送伪造信息引起交通事故的匿名车辆。协议可以让路边基站单元同时对多个匿名车辆发送的交通信息进行批量认证。该协议做了详细的安全性分析和性能分析。性能比较结果表明，该协议在智能车辆端的计算开销以及在路边基站单元端的通信开销都具有明显优势，而且无需搭建安全信道就能够实现匿名在线注册，因此可以安全高效地部署在智能车载自组织网络环境。

Anonymous Online Registration and Secure Authentication Protocol in Intelligent Vehicular Ad-hoc Networks

With the establishment of the Intelligent Transportation Systems (ITS), Vehicular Ad-hoc NETworks (VANETs) play great roles in improving traffic safety and efficiency. However, due to the openness and fragility of VANETs, they are vulnerable to various network threats and attacks, and thereby hindering the wide applications of VANETs. To address the requirements for authentication and integrity of transmitted data, identity privacy-preservation, an anonymous online registration and secure authentication protocol is proposed in intelligent VANETs. The protocol enables a vehicle to execute anonymous online registration in transportation systems Trusted Authority (TA) via a public channel. Once validating the real identity, TA can return the private key to the vehicle for subsequent secure authentication via public channel. Thus, the vehicle can generate an authenticated traffic message to a nearby RoadSide Unit (RSU) in real time, so that RSU performs the authentication and integrity verification. This protocol supports anonymous identity traceability, thus TA can revoke the real identity of a malicious vehicle, which has generated some forged messages and caused traffic jams or accidents. In addition, this protocol supports batch authentication and verification of those transmitted traffic messages from different anonymous vehicles. The detailed security analysis and performance evaluation have been conducted. The results demonstrate that the protocol has outstanding advantages on the computational costs of each vehicle and the communication overhead of RSU, and can realize anonymous online registration without establishing secure channel. Therefore, the protocol could be securely and efficiently deployed in intelligent VANETs.