We propose a novel attack that compromises the physical layer security in wireless systems with eavesdropper's channel state information at transmitter side. This technique is based on transmission of slowly-varying random symbol by eavesdropper during its uplink transmission, so equivalent fading observed base station (BS) has larger variance. Then, BS designs secure downlink under assumption ...

In this paper, we investigate an innovative physical layer security (PLS) scheme for uncertain reconfigurable intelligent surface- (RIS-) assisted communication system under eavesdropping attack. Specifically, in our proposed system, consider that the RIS is known to legitimate user while not eavesdropper (Eve). manner, reflective elements of are adjusted strengthen keen signals suppressing Eve...