面向Android应用的细粒度位置隐私保护系统

Fined-grained Location Privacy Protection System for Android Applications

位置隐私保护是移动定位服务中的关键安全问题,粗粒度的访问控制机制通过绝对的授权策略抑制了位置信息的暴露,但是忽略了用户的服务质量。提出一种针对本地位置信息的时空模糊算法,实现了细粒度的位置隐私保护系统,在保障用户服务质量的前提下实现位置信息的模糊,从而达到隐私保护的目的。首先设计了一种针对应用程序位置服务请求的位置信息拦截技术,截获精确位置信息,并使用位置模糊算法进行模糊处理;将模糊后的安全位置信息返回给Apps,从而实现位置隐私保护。实验结果证明了该方法的有效性。

The location privacy protection is a prominent problem in mobile location-based services.Coarse-grained permissions methods prevent location data exposure through absolute authorization policies without considering the service qualities of users.In this paper,a native location-based temporal-spatial obfuscation algorithm was proposed to implement the fine-grained location privacy protection system.It can protect user privacy through location cloak,which is also able to keep the service qualities.First,an interception method has been developed to capture the service requests and precise location data sent to applications and processes the location data with location obfuscation algorithm.Then the cloaked safe location data are returned to applications and the location privacy will be protected.The experimental results demonstrate the effectiveness of this method.