Apparatus and method for secure communication based on channel characteristics
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United States of America Patent
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Apr 28, 1998
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N/A
app pub date -
Jun 17, 1996
filing date -
Jun 17, 1996
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Abstract
A method and an apparatus for establishing a key sequence for secure communication through a communication channel between a first transceiver and a second transceiver. Each transceiver transmits to the other transceiver a plurality of tones having predetermined phases and frequencies. Each transceiver transmits back to the other transceiver, without substantial change, the plurality of tones transmitted by the other transceiver. The transceivers determine a key based on the differences in the phases of transmitted and received plurality of tones.
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