Achievable Rates for Two-Way Wire-Tap Channels

—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, (GTWWT), and the binary additive two-way wire-tap channel, (BATWWT). 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 wiretap channel (GMAC-WT) to illustrate this advantage.

• Type: Journal
• Year: 2007
• Where: CORR
• Authors: Ender Tekin, Aylin Yener
• Keywords: Achievable Rates, CORR 2007, Education, Two-way Channels, Two-way Wire-tap Channel