Privacy in Location-Based Services

development of mobile communication, applications represents a challenge for both conceptually and technically so the basic requirements of LBS (location-based services) are numerous. Complex task is to provide user with added value to location information. Previously using Trajectory privacy-preserving framework users location is preserved using various techniques, but the locations of users trajectories may not sensitive all the time. Even mix-zones are regions where users movement cannot be track by any applications. In this paper mobile users will reveal their location to database services in a periodic or on-demand manner. New spatial cloaking techniques based on real or historical user trajectory is designed to protect user location trajectories and also satisfy the users specified k-anonymity level.