Practical Secrecy using Artificial Noise

TL;DR

This paper introduces a practical secrecy criterion for secure communications using artificial noise, demonstrating that it can ensure security even against powerful eavesdroppers with more antennas.

Contribution

It proposes the concept of practical secrecy based on the eavesdropper's error probability and shows how artificial noise can guarantee this security criterion.

Findings

Practical secrecy can be achieved with artificial noise at high SNR.

Artificial noise guarantees security even when eavesdropper has more antennas.

The approach provides a new design criterion for secure wireless communication.

Abstract

In this paper, we consider the use of artificial noise for secure communications. We propose the notion of practical secrecy as a new design criterion based on the behavior of the eavesdropper's error probability $P_E$, as the signal-to-noise ratio goes to infinity. We then show that the practical secrecy can be guaranteed by the randomly distributed artificial noise with specified power. We show that it is possible to achieve practical secrecy even when the eavesdropper can afford more antennas than the transmitter.