Study On The Technology Of Location Privacy Protection System Based On Android Platform

With the continuous improvement of the mobile positioning devices and the wireless communication technology, and the development of mobile positioning equipment, the Location-Based Services (LBS) are produced. When people use LBS, they can enjoy a lot of convenience, such as, searching the closest restaurant to a hospital, navigation path, querying the situation of current traffic, etc. However the LBS can expose the users’ location information, and then threat the users’ privacy. The users’ location information is usually closely linked with the users’ identity information, for example, the name of their company, home address, health status, religious beliefs, etc. Researchers have conducted extensive studies for location privacy problem and they put forward some algorithms for protecting location information, including false location technology, data confusion, K-anonymous, and so on. Most of these algorithms only provide theoretical solution, and till now there is little practical research on how to integrate the location privacy protection into the Android system. Currently, the Android system mainly adopts the simple strategy of "open/close position tracking for all applications", and users can neither select their own favorite tracking applications, nor decide the privacy protection level for tracking application. In order to improve the user autonomy when they manage their location privacy, this thesis optimizes and improves the algorithms of location privacy protection in LBS, and applies them in the Android system, so that they can protect the sensitive location information from the initial phase of acquiring the GPS location information in Android.At present, more and more users are using mobile terminal equipment (such as, intelligent mobile phone, tablet, etc), which are installed with the Android system, so that they can enjoy the convenience of the LBS at any time. At the same time, the users become more worried about their location privacy. To protect the user’s location information in Android system, this thesis proposes a disguising algorithm for circular region and a disguising algorithm for rectangular area. These are two novel algorithms by combining and improving the location cloaking algorithms based on regional characteristics, false location technology and K-anonymous. Both of them are also applied into the Android system, so as to realize the location privacy protection.In this thesis, after implementing the improved location privacy protection algorithms, the protected location information is acquired, a black and white list is configured for all applications based on the user’s preference, the correct protection level is adjusted. Therefore the users can get autonomous control on their location. Experiments are also conducted to implement and test the algorithms, in which the algorithms demonstrate advantages, including high efficiency, low space consumption rate, full functions and less distortion.