Reliable and Secure Transmission for Future Networks

This paper introduces a novel physical layer encryption method called randomized reciprocal channel modulation (RRCM) for reliable and secure transmission of information against eavesdropper (Eve) with any number of antennas and any noise level. RRCM makes it computationally complex for Eve to estimate the user's channel state information (CSI) that is used to scramble the information symbols transmitted between users. Subject to Eve's failure to overcome the physical-layer computational complexity, users can apply RRCM to achieve a virtually constant (significant) rate in bits/s/Hz of unconditional secrecy - unconditional on Eve's number of antennas, Eve's noise level and the CSI coherence time.