Achievable Rates for Two-Way Wire-Tap Channels

Details Achievable Rates for Two-Way Wire-Tap Channels Achievable Rates for Two-Way Wire-Tap Channels

2007-04-23

arxiv.org/abs/0704.3035v1

Computer Science

Information Theory

International Symposium on Information Theory (ISIT) 2007, June 24-29

Scientific paper

We consider two-way wire-tap channels, where two users are communicating with each other in the presence of an eavesdropper, who has access to the communications through a multiple-access channel. We find achievable rates for two different scenarios, the Gaussian two-way wire-tap channel, (GTW-WT), and the binary additive two-way wire-tap channel, (BATW-WT). It is shown that the two-way channels inherently provide a unique advantage for wire-tapped scenarios, as the users know their own transmitted signals and in effect help encrypt the other user's messages, similar to a one-time pad. We compare the achievable rates to that of the Gaussian multiple-access wire-tap channel (GMAC-WT) to illustrate this advantage.

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