基于代理重加密的VANETs中安全位置服务

提供车辆位置服务是车载网络(vehicle ad hoc networks, VANETs)的重要应用。而用户(车辆行驶人)希望他的位置信息只能暴露于他授权的消息发送者，这就涉及位置隐私问题。提出基于代理重加密的安全位置服务算法(proxy re-encryption- based secure location service, PRESLS)。PRESLS算法采用中心管理模式，并由交通信息港(traffic information center, TIC)扮演中心管理者，且由TIC维持车辆轨迹数据，同时，TIC作为车辆与路边设施单元的中介，使得路边设施单元能安全地共享轨迹数据。利用代理重加密算法，使得轨迹数据不仅对未授权的实体，而且对TIC也是隐匿的，进而实现了位置数据所保密性。通过安全性能分析和基于地图位置服务(map-based location service, MBLS)的实验评估PRESLS算法的性能。分析表明，车辆能够控制仅由车辆允可的路边设施单元才能接入车辆的轨迹数据。同时，基于MBLS的实验数据表明，PRESLS算法在维持车辆轨迹数据安全的同时，并没有降低位置查询成功率。

Proxy re-encryption-based secure location service in VANETs

One promising application is a location aware service which provides vehicles with useful information. However, from a security perspective, users want their driving locations not to be exposed to others except for their authorized senders, this is a secure issue. Therefore, proxy re-encryption based secure location service (PRESLS) is proposed in this paper. PRESLS introduces a central manager which maintains vehicles trajectory data and acts as a broker between vehicles and roadside units to share the trajectory data, and the Traffic Information Center is considered to be central manager. PRESLS makes the trajectory data hidden from not only unauthorized entities but also the central manager by making use of proxy re-encryption schemes. Finally, the performance of the PRESLS is analyzed through map-based location service (MBLS). The simulation results show that vehicle can control that only the sender roadside unit designated by the vehicle can access the trajectory data of the vehicle. At the same time, PRESLS can guarantee the security of the location services, and query success ratio has not declined.