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Illegal intelligent reflecting surfaces (I-IRSs), i.e., the illegaldeployment and utilization of IRSs, impose serious harmful impacts on wirelessnetworks. The existing I-IRS-based illegal jammer (IJ) requires channel stateinformation (CSI) or extra power or both, and therefore, the I-IRS-based IJseems to be difficult to implement in practical wireless networks. To raiseconcerns about significant potential threats posed by I-IRSs, we propose analternative method to jam legitimate users (LUs) without relying on the CSI. Byusing an I-IRS to actively change wireless channels, the orthogonality ofmulti-user beamforming vectors and the co-user channels is destroyed, andsignificant inter-user interference is then caused, which is referred to asactive channel aging. Such a fully-passive jammer (FPJ) can launch jammingattacks on multi-user multiple-input single-output (MU-MISO) systems viainter-user interference caused by active channel aging, where the IJ requiresno additional transmit power and instantaneous CSI. The simulation results showthe effectiveness of the proposed FPJ scheme. Moreover, we also investigate howthe transmit power and the number of quantization phase shift bits influencethe jamming performance.

Illegal Intelligent Reflecting Surface Based Active Channel Aging: When Jammer Can Attack Without Power and CSI