Relay Channels with Confidential Messages
Yasutada Oohama

TL;DR
This paper investigates secure communication over relay channels where the relay can also act as a wire-tapper, defining and analyzing rate regions for confidential message transmission with deterministic and stochastic encoders.
Contribution
It introduces two new rate region definitions for relay channels with confidential messages and derives bounds, showing stochastic encoding can improve security and rate.
Findings
Explicit inner and outer bounds for rate regions
Stochastic encoder enlarges the rate region
Evaluation of Gaussian relay channel with confidentiality constraints
Abstract
We consider a relay channel where a relay helps the transmission of messages from one sender to one receiver. The relay is considered not only as a sender that helps the message transmission but as a wire-tapper who can obtain some knowledge about the transmitted messages. In this paper we study the coding problem of the relay channel under the situation that some of transmitted messages are confidential to the relay. A security of such confidential messages is measured by the conditional entropy. The rate region is defined by the set of transmission rates for which messages are reliably transmitted and the security of confidential messages is larger than a prescribed level. In this paper we give two definition of the rate region. We first define the rate region in the case of deterministic encoder and call it the deterministic rate region. Next, we define the rate region in the case of…
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Taxonomy
TopicsWireless Communication Security Techniques · Cooperative Communication and Network Coding · DNA and Biological Computing
