Towards efficient and secure quantum-classical communication networks

TL;DR

This paper reviews quantum-safe cryptographic protocols, specifically QKD and PQC, discussing their advantages and drawbacks, and explores hybrid approaches to enhance security and performance in quantum-classical communication networks.

Contribution

It provides a comparative analysis of QKD and PQC and proposes combining these methods to improve security and efficiency in quantum-classical networks.

Findings

QKD offers unconditional security but has practical limitations.

PQC is more practical but may have security assumptions.

Hybrid protocols can leverage strengths of both approaches.

Abstract

The rapid advancement of quantum technologies calls for the design and deployment of quantum-safe cryptographic protocols and communication networks. There are two primary approaches to achieving quantum-resistant security: quantum key distribution (QKD) and post-quantum cryptography (PQC). While each offers unique advantages, both have drawbacks in practical implementation. In this work, we introduce the pros and cons of these protocols and explore how they can be combined to achieve a higher level of security and/or improved performance in key distribution. We hope our discussion inspires further research into the design of hybrid cryptographic protocols for quantum-classical communication networks.