Interference Assisted Secret Communication

TL;DR

This paper explores how interference can be strategically used to enhance secrecy in wireless communication by introducing a helper interferer that improves the secrecy rate against eavesdroppers.

Contribution

It introduces the WT-HI model, providing achievable secrecy rates and outer bounds for both discrete and Gaussian channels, advancing physical layer security techniques.

Findings

Achievable secrecy rates for WT-HI model.

Outer bounds on secrecy capacity.

Interference can be exploited to improve secrecy.

Abstract

Wireless communication is susceptible to eavesdropping attacks because of its broadcast nature. This paper illustrates how interference can be used to counter eavesdropping and assist secrecy. In particular, a wire-tap channel with a helping interferer (WT-HI) is considered. Here, a transmitter sends a confidential message to its intended receiver in the presence of a passive eavesdropper and with the help of an independent interferer. The interferer, which does not know the confidential message, helps in ensuring the secrecy of the message by sending an independent signal. An achievable secrecy rate and several computable outer bounds on the secrecy capacity of the WT-HI are given for both discrete memoryless and Gaussian channels.