A Product Channel Attack to Wireless Physical Layer Security

Abstract

We propose a novel attack that compromises the physical layer security of downlink (DL) communications in wireless systems. This technique is based on the transmission of a slowly-varying random symbol by the eavesdropper during its uplink transmission, so that the equivalent fading channel observed at the base station (BS) has a larger variance. Then, the BS designs the secure DL transmission under the assumption that the eavesdropper's channel experiences a larger fading severity than in reality. We show that this approach can lead the BS to transmit to Bob at a rate larger than the secrecy capacity, thus compromising the system secure operation. Our analytical results, corroborated by simulations, show that the use of multiple antennas at the BS may partially alleviate but not immunize against these type of attacks.

Survey on physical layer security for 5G wireless networks

“…Other secure massive transmissions against active eavesdropper include cooperative scheme strategy [117], a product channel attack [118], data-aided secure downlink transmission scheme [119], and the secure communications design based on game theory [120].…”