CSI-Free Physical Layer Security against Eavesdropping Attack based on Intelligent Surface for Industrial Wireless

Industrial wireless networks (IWNs) systems require high performance and high security in critical manufacturing processes. However, the wireless environment suffers from low performances and fragile security due to lack of physical connection. In this paper, by taking advantages of reconfigurable intelligent surface (RIS) to enhance the physical layer (PHY) security of IWNs thus to resist eavesdropping attacks, where RIS reflects the incident signal at a certain phase shift to assist the legitimate transmission partners to transfer secret information without eavesdroppers’ channel state information(CSI). In this way, the reflection of radio waves is actively controlled to overcome the negative effects of natural wireless propagation. The average secrecy capacity of the legal users is maximized by optimizing the phase shift of the RIS, which provides a cost-effective high security transmission solution for the IWNs. The widely experiments proof the effectiveness of proposed scheme.