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Abstract: This work considers the two-way wiretap channel in which two legitimateusers, Alice and Bob, wish to exchange messages securely in the presence of apassive eavesdropper Eve. In the full-duplex scenario, where each node cantransmit and receive simultaneously, we obtain new achievable secrecy rateregions based on the idea of allowing the two users to jointly optimize theirchannel prefixing distributions and binning codebooks in addition to keysharing. The new regions are shown to be strictly larger than the known onesfor a wide class of discrete memoryless and Gaussian channels. In thehalf-duplex case, where a user can only transmit or receive on any given degreeof freedom, we introduce the idea of randomized scheduling and establish thesignificant gain it offers in terms of the achievable secrecy sum-rate. Wefurther develop an experimental setup based on a IEEE 802.15.4-enabled sensorboards, and use this testbed to show that one can exploit the two-way nature ofthe communication, via appropriately randomizing the transmit power levels andtransmission schedule, to introduce significant ambiguity at a noiseless Eve.



Author: Aly El Gamal, O. Ozan Koyluoglu, Moustafa Youssef, Hesham El Gamal

Source: https://arxiv.org/







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