Detect Pilot Spoofing Attack for Intelligent Reflecting Surface Assisted Systems

Pilot spoofing attack (PSA) is a kind of active eavesdropping, which launches the identical training sequence to manipulate channel estimation outcome during pilot phase. The newly proposed intelligent reflecting surface (IRS) system vulnerable PSA because it relies on pilot-assisted methods obtain statement information (CSI). To combat in IRS-assisted systems, we consider two significant challenges: 1) distribution (CDI) uncertain, will make detection based statistic feature (SF) invalid; 2) noise uncertain when detecting practical scenarios, would impair popular energy-based detectors. In this paper, design three-step (TST) scheme. effective detector could achieve reliable performance by examining transmitter's received signal power levels occurs. method does not require prior knowledge variance and CSI both legitimate illegitimate dyadic backscatter channels. Theoretical analysis numerical simulations are presented further demonstrate efficiency our TST