On the Role of Feedback in Two-Way Secure Communication

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Executive Summary

For bi-directional communication, the most general form of encoders should consider the signals received in the past as inputs. However, in practice, it would also be highly desirable if feedback could be ignored for encoding purposes since this would lead to a simple system design. In this paper, the authors investigate the question of whether and how much loss in secrecy rate would be incurred, if such an approach were taken. To do so, they investigate the role of feedback in secrecy for two three-node two-way channel models. First, they show that feedback is indeed useful for a class of full-duplex two-way wire-tap channels. In this case, when feedback is ignored, the channel is equivalent to a Gaussian degraded relay channel with confidential messages to the relay.

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