Title

Half-duplex active eavesdropping in fast-fading channels: A block-markov wyner secrecy encoding scheme

Document Type

Article

Publication Date

6-25-2012

Abstract

In this paper, we study the problem of half-duplex active eavesdropping in fast-fading channels. The active eavesdropper is a more powerful adversary than the classical eavesdropper. It can choose between two functional modes: eavesdropping the transmission between the legitimate parties (Ex mode), and jamming it (Jx mode)-the active eavesdropper cannot function in full duplex mode. We consider a conservative scenario, when the active eavesdropper can choose its strategy based on the legitimate transmitter-receiver pair's strategy, and thus, the transmitter and legitimate receiver have to plan for the worst. We show that conventional physical-layer secrecy approaches perform poorly (if at all), and we introduce a novel encoding scheme, based on very limited and unsecured feedback-the Block-Markov Wyner encoding scheme-which outperforms any schemes currently available. © 2012 IEEE.

Publication Source (Journal or Book title)

IEEE Transactions on Information Theory

First Page

4660

Last Page

4677

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