The Role of Feedback in Two-way Secure Communications
Xiang He, Aylin Yener

TL;DR
This paper investigates the impact of feedback on the secrecy capacity of two-way secure communication channels, showing feedback can significantly improve secrecy rates in some models but has limited effect in others.
Contribution
It derives bounds for secrecy capacity with feedback in Gaussian two-way wiretap and relay channels, highlighting when feedback is beneficial or negligible.
Findings
Feedback can cause unbounded secrecy rate loss if not used.
In some models, feedback greatly enhances secrecy capacity.
Simple time sharing with cooperative jamming is effective and near optimal.
Abstract
Most practical communication links are bi-directional. In these models, since the source node also receives signals, its encoder has the option of computing its output based on the signals it received in the past. On the other hand, from a practical point of view, it would also be desirable to identify the cases where such an encoder design may not improve communication rates. This question is particularly interesting for the case where the transmitted messages and the feedback signals are subject to eavesdropping. In this work, we investigate the question of how much impact the feedback has on the secrecy capacity by studying two fundamental models. First, we consider the Gaussian two-way wiretap channel and derive an outer bound for its secrecy capacity region. We show that the secrecy rate loss can be unbounded when feedback signals are not utilized except for a special case we…
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Taxonomy
TopicsWireless Communication Security Techniques · Chaos-based Image/Signal Encryption · Cooperative Communication and Network Coding
