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As wireless devices proliferate, in many situations the authors wish to authenticate devices by mere proximity. This is the common authentication mechanism for wired devices where they plug them into each other. In this paper the authors propose a scheme for authenticating nearby wireless devices that share no prior secrets. The scheme takes advantage of multiple antennae built in many modern wireless devices. The scheme is based on the characteristic of wireless channels that the power of the received signal is inverse proportional to some exponent of the distance between the sender and receiver.
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