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In this paper, we investigate how an illegitimate user can use areconfigurable intelligent surface (RIS) to maximally degrade the secrecyperformance of the legitimate system. We first consider the case when theillegitimate user performs eavesdropping only. A problem is formulated tominimize the system secrecy rate by optimizing the phase shifts of the RISelements. We also consider the case when the illegitimate user works withfull-duplex technology and can perform eavesdropping and jamming simultaneouslythrough the RIS. A problem is formulated to minimize the system secrecy rate byoptimizing the jamming power and the phase shifts of the RIS elements. Althoughthe two formulated problems are nonconvex, they are optimally solved in thispaper. Our results show that good eavesdropping performance can be achieved byplacing the RIS at an appropriate position. Further, jamming plus eavesdroppingcan largely reduce the secrecy rate of the legitimate system.

Performance of A Reconfigurable Intelligent Surface Controlled by An Illegitimate User