Simulated Covert Communication and Work Towards Discrete Gaussian-Modulated Quantum Key Distribution

Abstract

Quantum key distribution (QKD) leverages quantum mechanics to share secret random keys between parties. These keys can be used to construct encryption which is unconditionally secure. This thesis first discusses the theory behind discrete Gaussian-modulated QKD, as well as work towards its realization using a fiber interferometer. A Red Pitaya single-board computer is used to stabilize the phase of the interferometer by way of a piezoelectric ring. Results of this implementation are presented as well as preliminary test data. The latter part of this thesis relates to covert communication. Distinct from secrecy, covertness entails communication which is itself undetectable, independent of the content or security of the data being communicated. Methods for assessing covert performance are detailed. A simulation for evaluating covert performance across arbitrary optical networks is presented. The simulation is based in Mininet, an open-source network emulator and testbed under active development.