Research On Location Privacy Protection Technology In Mobile Network Environment

With the rapid development of mobile Internet and the popularity of smart phones, based Services Location(LBS) for our life provides more and more convenience. Based on location services integrated positioning, mobile communications, geographic information and other technologies, mobile users can get a variety of location-based services, such as navigation, sign, make friends and search for nearby gas stations, etc.. However, location-based services provide convenience to people's daily life, but also to expose the hidden dangers of user location privacy. Users in the use of location-based services, will send their location information to the server, in this process, there will be a security threat to leak user location privacy. Therefore, it is very important to ensure the quality of service, and to ensure the security of user's location information. This article has done the following work based on the privacy protection of the location service:(1) In the center of the server structure, the mobile user is no longer like in the end-to-end structure and distributed structure, as there are other users around to help their anonymous. In this case, the mobile user is usually using the virtual location method to achieve k-anonymity. The previous virtual location method is randomly generated virtual positions to help user anonymous. To traffic and the attacker who grasp the background information of geography, using the background information can be easily excluded those virtual positions which do not comply with the background information, making anonymous effect greatly reduced. Aiming at this problem, this paper improves the virtual location method.(2) In the k-anonymity, there are two important parameters which directly affect the final result of anonymity. One is the degree of anonymity K, the greater K, the better the effect of anonymity, on the contrary, the smaller K, the samller anonymous effect. Another parameter is the area of anonymous area, the greater the area anonymous effect is better, the smaller the area, the smaller the effect is. In the past, the traditional virtual location scheme doesn't consider the effect of anonymous area on the anonymity of K. To solve this problem, this paper introduces anonymous area into anonymous algorithm.(3) In the actual life, users in different scenarios may have different levels of privacy requirements. For example, when users search near the restaurant does not require very high privacy protection, such communication delays will be very small, the users can faster to get the results they want; and when users use LBS search private queries may require a high degree of privacy protection. This requirement is considered in this paper.