Securing wireless networks using unique device and link characteristics

We explore the use of unique device characteristics that we call fingerprints, and unique wireless link characteristics that we call link signatures, for enhancing wireless network security. Our fingerprinting research complements the traditional password and certificate methods for authenticating and identifying devices. Specifically, we show how the clock skew of an access point can be used as its fingerprint to detect unauthorized access points in wireless local area networks quickly and accurately.