The Role of Feedback in Two-Way Secure Communications

DOI10.1109/TIT.2013.2281711zbMATH Open1364.94543arXiv0911.4432MaRDI QIDQ5346212

Aylin Yener, Xiang He

Publication date: 8 June 2017

Published in: IEEE Transactions on Information Theory (Search for Journal in Brave)

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 identify, and thus conclude that utilizing feedback can be highly beneficial in general. Second, we consider a half-duplex Gaussian two-way relay channel where the relay node is also an eavesdropper, and find that the impact of feedback is less pronounced compared to the previous scenario. Specifically, the loss in secrecy rate, when ignoring the feedback, is quantified to be less than 0.5 bit per channel use when the relay power goes to infinity. This achievable rate region is obtained with simple time sharing along with cooperative jamming, which, with its simplicity and near optimum performance, is a viable alternative to an encoder that utilizes feedback signals.

Full work available at URL: https://arxiv.org/abs/0911.4432

Mathematics Subject Classification ID

Cryptography (94A60) Communication theory (94A05)

Recommendations

• Title not available (Why is that?) 👍 👎
• Security of direct communication quantum channel with feedback 👍 👎
• Secure communications over insecure channels 👍 👎
• Feedback-Based Collaborative Secrecy Encoding Over Binary Symmetric Channels 👍 👎
• The Wiretap Channel With Feedback: Encryption Over the Channel 👍 👎
• Cryptanalysis of Secure Message Transmission Protocols with Feedback 👍 👎
• Wiretap Channel With Secure Rate-Limited Feedback 👍 👎
• The Wiretap Channel With Generalized Feedback: Secure Communication and Key Generation 👍 👎
• On the Secure Degrees of Freedom of Relaying With Half-Duplex Feedback 👍 👎
• Secure Communications With Insecure Feedback: Breaking the High-SNR Ceiling 👍 👎

This page was built for publication: The Role of Feedback in Two-Way Secure Communications

Report a bug (only for logged in users!)Click here to report a bug for this page (MaRDI item Q5346212)