Privacy Preserving in a Location Proof Updating System Using Android

Abstract — Now a day’s mobile devices have inbuilt GPS systems such as smartphones and PDAs which plays as increasingly important role in location based services. In location – based applications and services users require proving their locations at a particular time. There are lots of applications in market that helps to track someone’s location. As location proof plays a critical role in enabling these applications, they are location – sensitive. The common gain of all these applications is that they offer certain geographical location of a person carrying GPS enabled device. But sometimes users lie about their locations. Location – Based Services (LBS) personalize the service they provide or grant access to resources according to the current location of users. They are used in a variety of contexts, such as real-time traffic monitoring, discount tied to the visit of a particular shop. In most of current schemes, the location of a user/device is determined by the device itself (eg. through GPS) and forwarded to the LBS provider. By doing so, a user can cheat by having his device transmitting a false location to gain access to unauthorized resources, thus raising the issue of verifying the position claimed by a particular user. To counter this threat, LBS should ideally require the requesting device to formally prove that it really is at the claimed location. This notion has been formalized through the concept of location proof which is a proves that someone was at a particular location at a specific moment in time