Enhancing location privacy in wireless LAN through disposable interface identifiers: a quantitative analysis

  • Authors:
  • Marco Gruteser;Dirk Grunwald

  • Affiliations:
  • Department of Computer Science, University of Colorado, Boulder, CO;Department of Computer Science, University of Colorado, Boulder, CO

  • Venue:
  • Mobile Networks and Applications - Special issue: Wireless mobile wireless applications and services on WLAN hotspots
  • Year:
  • 2005

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Abstract

The recent proliferation of wireless local area networks (WLAN) has introduced new location privacy risks. An adversary controlling several access points could triangulate a client's position. In addition, interface identifiers uniquely identify each client, allowing tracking of location over time. We enhance location privacy through frequent disposal of a client's interface identifier. While not preventing triangulation per se, it protects against an adversary following a user's movements over time. Design challenges include selecting new interface identifiers, detecting address collisions at the MAC layer, and timing identifier switches to balance network disruptions against privacy protection. Using a modified authentication protocol, network operators can still control access to their network. An analysis of a public WLAN usage trace shows that disposing addresses before reassociation already yields significant privacy improvements.