摘要： 随着车载自组网应用对安全性要求的提高，用户和服务提供商对各自私有信息保密性的要求也越来越高。针对现有查询方案无法同时保护车辆身份、位置及服务提供商数据隐私的问题，利用私有信息检索技术，提出一种高效的位置服务查询方案。采用匿名认证的方法进行车辆间的相互认证与车辆及路边基站的认证。在此基础上，使用安全硬件对数据库的数据进行混淆处理，通过代理重加密完成车辆对数据库服务数据的检索，从而实现车辆和数据库双方的隐私保护。分析结果表明，该方案可实现车辆身份匿名查询，能够保护车辆位置隐私和服务提供商的数据库信息，且只需两轮通信，具有较高的通信效率。

关键词: 车载自组网, 基于位置服务, 代理重加密, 双线性映射群, 匿名认证

Abstract: With the enhanced security requirements of the Vehicular Ad Hoc Networks(VANETs) applications, vehicles and service providers have a high demand on their privacy information. The traditional privacy preserving query schemes of mobile devices cannot both protect the privacy information of the vehicle and the service provider database. This paper proposes an efficient location service query scheme by using the Private Information Retrieval(PIR) technology. Vehicles verify other vehicles and roadside base station by anonymous authentication. Meanwhile, the data of the service provider database is confused by the secure coprocessor, and the query service is implemented by the Proxy Re-cryptography(PRC) algorithm. The scheme can protect the privacy information of both vehicle and service provider database. Analysis shows that this scheme not only achieves the vehicle’s anonymous query, but also protects both the location privacy of vehicles and the data privacy of service provider databases. Moreover, the communication cost is only twice, and has the high efficiency of communication.

Key words: Vehicular Ad Hoc Networks(VANETs), Location-based Services(LBS), Proxy Re-cryptography(PRC), bilinear mapping groups, anonymous authentication

中图分类号: 

• TP309