LAUSR

This letter studies a channel-aware source-channel (CASC) key generation approach. Specifically, when the estimated legitimate channel is in good condition, the existing channel-model-based key generation is adopted where the transmitter sends a key to the receiver; otherwise, the source-model-based key generation is adopted where the legitimate transceivers agree on a key via their observations of the wireless channel. Both the exact and the approximate key rates of the CASC scheme are analyzed. Numerical results are provided to evaluate the performance of the proposed scheme.