Privacy protection in location-sharing services

With the fast development in mobile computing devices, location-sensing technology and wireless communication, new applications for share users´ real-time location information are developing at an amazing pace. Location privacy is of utmost concern for location-sharing services. There is already a full agreement that users would like to have the complete control over their location information. Existing privacy protection methods often let users specify their privacy peferences to the service provider and thus not only fail to consider the dynamic nature of privacy preferences but also fail to protect user privacy from service provider. In this paper, we propose an user-centric privacy access control method. By separating sensitive privacy polices apart from standard privacy policies, which are now stored at user side and therefore fully under user´s control, we demonstrate that our system can provide users with a flexible way of complete controlling over information about their location without adding too much user burden.