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A Product Channel Attack to Wireless Physical Layer Security

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Document pages: 5 pages

Abstract: We propose a novel attack that compromises the physical layer security ofdownlink (DL) communications in wireless systems. This technique is based onthe transmission of a slowly-varying random symbol by the eavesdropper duringits uplink transmission, so that the equivalent fading channel observed at thebase station (BS) has a larger variance. Then, the BS designs the secure DLtransmission under the assumption that the eavesdropper s channel experiences alarger fading severity than in reality. We show that this approach can lead theBS to transmit to Bob at a rate larger than the secrecy capacity, thuscompromising the system secure operation. Our analytical results, corroboratedby simulations, show that the use of multiple antennas at the BS may partiallyalleviate but not immunize against these type of attacks.

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