Enhancing Physical-Layer Security in 6G Networks Through Integrating Irregular Reconfigurable Intelligent Surfaces

Recently, both business and academics have shown an immense amount of interest in reconfigurable intelligent surfaces (RISs) because of its affordability and versatility in modifying the amplitude and phase of wireless signals using inexpensive passive reflecting components. For 6G wireless communication networks, several RIS-assisted methods have been put out to increase data throughput and energy efficiency. Regarding a time-division duplex (TDD) downlink cellular wire-tap network, that comprises of one base station (BS) that has several antennas, several legitimate parts for user equipment (UE), numerous eavesdroppers (EVEs) & several RISs, researcher present an innovative RIS depended channel randomization (RCR) technique in this research to improve physical-layer security (PLS). The terahertz (THz) radio region could be utilized at 6G net, researcher assume that there is only a line-of-sight (LOS) path among RISs, UE and BS. As part of the suggested method, each RIS creates several reflection matrices in a pseudo-random way and then uses for the pilot signal duration (PSD) at the uplink & the data transmission duration (DTD) at the downlink. For each reflection matrix, the BS figures out the UE's wireless channels using all of the RIS's reflection matrices and chooses the UE with an optimal secrecy rate. The presented method achieves higher levels of privacy compared to standard methods.