An Achievable Region for the Multiple Access Wiretap Channels with Confidential and Open Messages

TL;DR

This paper characterizes an achievable secrecy rate region for a multiple access wiretap channel with both confidential and open messages, ensuring reliable communication for legitimate users while protecting confidential info from eavesdroppers.

Contribution

It introduces a new achievable region for the DM MAC-WT channel with mixed message types, extending previous models to include open messages alongside confidential ones.

Findings

Established an achievable secrecy rate region using random coding.

Demonstrated perfect secrecy with arbitrarily small error probability.

Provided theoretical bounds for secure communication in MAC-WT channels.

Abstract

This paper investigates the capacity region of a discrete memoryless (DM) multiple access wiretap (MAC-WT) channel where, besides confidential messages, the users have also open messages to transmit. All these messages are intended for the legitimate receiver but only the confidential messages need to be protected from the eavesdropper. By using random coding, we find an achievable secrecy rate region, within which perfect secrecy can be realized, i.e., all users can communicate with the legitimate receiver with arbitrarily small probability of error, while the confidential information leaked to the eavesdropper tends to zero.