A spatial region with K different footprints indicates that it has been visited by K different people. An adversary may be able to identify all these users, but will not know who was there at what time. This observation gives us a new direction to investigate location depersonalization in location-based services (LBSs). We propose to leverage users’ historical location samples, each being a foo...

In this paper, we investigate the prospects of using Session Initiation Protocol (SIP) in context—aware services. We focus on the location-based paradigm in which the users' location is the contextual parameter used for service adaptation and delivery. We present the general steps required to achieve this and elaborate on an architecture that uses a SIP-enabled Value Added Service Provider as t...

Location-based services require users to continuously report their location to a potentially untrusted server to obtain services based on their location, which can expose them to privacy risks. The system only requires a semi-trusted third party, responsible for carrying out simple matching operations correctly. This semi-trusted third party does not have any information about a user’s location...

Location-Based Services (LBSs) stands for the provision of information about the position of a device or a user, often offered as a service via various means of media. The position can be combined with spatial information so as to integrate an LBS system with Geographical Information Systems (GISs) or other location dependent information. The quality of the services provided by the LBSs depends...