Details of Research Outputs

基于位置服务（LBS）中的隐私保护方法存在如下常见问题:重视用户端隐私保护而容易忽略LBS服务端的数据安全;隐私保护强度高的方法实用效率低;隐私保护方法大多面向欧氏空间提出,无法适用路网环境,查询准确率低.针对上述问题,基于不经意传输提出了一种LBS兴趣点查询服务中的隐私保护方法,在保护用户位置和查询内容隐私的同时确保LBS服务端数据安全,并能确保路网连续查询的效率和准确率.性能分析及实验结果表明,新方法具有较强的安全性和良好的工作效率. 

There are three common defects in existing location based service (LBS) privacy-preserving methods: only considering privacy preservation of the user without caring about data security of LBS server. The stronger a privacy-preserving method is, the less practical it is. Privacy-preserving methods are usually proposed based on the Euclidean space without considering actual factors in road network, and the query accuracy declines consequently. To solve the above problems, an LBS privacy-preserving scheme was proposed based on oblivious transfer with special distribution information for points of interest in road network. This scheme ensures data security of LBS server while preserving the user's location privacy and query content privacy, at the same time, it is applicable for continuous query in road network and guarantees the query efficiency and accuracy. Performance analysis and extensive experiments show that this scheme ensures strong security and works efficiently.