Microsoft Corporation
Adaptive decoder selection for cryptographic key generation

Abstract:

A method and apparatus for encrypting communications between two radio frequency (RF) transceivers selects a level of encryption based on device characteristics of the two RF transceivers. Each RF transceiver generates a common sequence having an integer, M, symbols based on the selected encryption level and on signals received from the other RF transceiver. Each RF transceiver then generates a cryptographic key based upon the common sequence, encrypts a message using the cryptographic key, and sends the encrypted message to the other RF transceiver. In one embodiment, the M symbols are selected from an alphabet where the value M and the size of the alphabet are selected based on the device characteristics of the two RF transceivers.