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Apress eBooks

Post-Quantum Cryptography

Robert Ciesla

Published Jan 1, 2020• 18 citations
Publisher

Abstract

For the last few chapters, we have kept a focus on quantum key distribution, or QKD. This maturing technology is still going to be relevant for a long time. What's going to come with it is known as post-quantum cryptography , which will be the main topic for this chapter. We'll explore an overview of this topic, going through the basics of the most relevant approaches to encryption schemes in the post-quantum realm.

DOI
10.1007/978-1-4842-6056-2_14

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For the last few chapters, we have kept a focus on quantum key distribution, or QKD. This maturing technology is still going to be relevant for a long time. What's going to come with it is known as post-quantum cryptography , which will be the main topic for this chapter. We'll explore an overview of this topic, going through the basics of the most relevant approaches to encryption schemes in the post-quantum realm.
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Quantum technology, and especially quantum computing, is advancing rapidly. Our every-day secure communication infrastructure relies heavily on public key cryptography; unfortunately, many public key schemes are in fact insecure against quantum algorithms. Furthermore, adversaries who, today, capture information encrypted using classical key distribution systems, can wait and, as soon as quantum computers of sufficient power become available, they may decipher all previously captured information. While some new “post-quantum” public key systems are assumed to be secure against quantum computers, this is only an assumption and, even if the assumption remains valid, still results in systems that are less efficient for end-users than the more commonly used public key systems employed today. While the advent of quantum technology may seem detrimental to security, in fact, one may harness the power of quantum through quantum key distribution (QKD) for stronger security guarantees. Such QKD protocols allow two (or more) parties to establish a shared secret key, secure against an all-powerful adversary. Perhaps surprising is that QKD technology is already here both experimentally and commercially. This tutorial serves as an introduction to basic QKD along with QKD technology from a practical perspective. Quantum communication is a highly interdisciplinary field of research and one of the goals of this article is to introduce a larger set of researchers and practitioners to its study in the hopes of furthering its progress and eventual wide-scale adoption.
Advances in quantum computing and particularly their impact on security and privacy is a topic of increasing importance to IT practitioners. The authors provide a readily understandable introduction to quantum computing, as well as post-quantum cryptography. They also explain post-quantum cryptographic solutions such as quantum-resistant algorithms and quantum key distribution. Lastly, the suitability of these solutions is addressed with a focus on their impact on the modern cryptographic infrastructure and applicability to the IT profession.