Enhanced physical layer security using reconfigurable intelligent surfaces (RIS)

The paper proposes to enhance the physical layer security (PLS) of wireless systems using reconfigurable intelligent surfaces (RIS). We derive the secrecy outage probability (SOP) and the probability of strictly positive secrecy capacity (SPSC) of wireless systems using RIS. We show that the use of RIS improves the security of physical layer by 10-40 dB with respect to conventional wireless systems without RIS. The system model contains a source S, a destination D, RIS and an eavesdropper E. RIS is deployed as a reflector or a transmitter. Reflections on RIS arrive with the same phase at the destination while the eavesdropper receives signals on a direct link between S and E.