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Privacy is an increasingly important theme in communications. With increasing mobile users, previously neglected aspects as location privacy become important in the peoples social life. Currently, Instant Messaging applications are considered to have a strong privacy model between users, because all communications are mediated by the service. In this paper, the authors analyze IM under the light of location privacy. they devise a set of potential attacks, and analyze the behavior of many systems under these attacks. Their results show that while not all implementations are vulnerable, some popular IMs are breachable by one or more of these location privacy attacks. With browser based and mobile implementations being less vulnerable because they tend to provide a reduced set of features, thus reducing the attack surface.
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