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Springer eBooks

Quantum-Key Distribution (QKD) Fundamentals

Ivan B. Djordjević

Published Jan 1, 2019• 4 citations
Publisher
DOI
10.1007/978-3-030-27565-5_6

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Quantum Key Distribution (QKD) Fundamentals

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We present the fundamental architecture and functions of quantum key distribution (QKD) network that support multiple applications. As applications on the QKD network, we introduce a quantum key distribution-advanced encryption standard (QKD-AES) hybrid system and an encrypted smartphone system.

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American Journal Of Cryptography And Network Security•Oct 31, 2020•0 citations
Many researchers have contributed to creating Quantum Key Distribution (QKD) since the first protocol BB84 was proposed in 1984.One of the crucial problems in QKD is to guarantee its security with finite-key lengths by Privacy Amplification (PA).However, finite-key analyses show a trade-off between the security of BB84 and the secure key rates.This study analyses two examples to show concrete trade-offs.Furthermore, even though the QKD keys have been perceived to be arbitrarily secure, this study shows a fundamental limitation in the security of the keys by connecting Leftover Hash Lemma and Guessing Secrecy on the QKD keys.
Quantum Key Distribution (QKD) is a revolutionary cryptographic technique that leverages the principles of quantum mechanics to secure communication channels. Unlike classical key exchange mechanisms, QKD offers provably secure key distribution by detecting any eavesdropping attempts. This paper explores the fundamental principles of QKD, the major QKD protocols, its applications in secure communications, and the technical challenges hindering widespread adoption. Furthermore, future research directions and advancements needed for large-scale implementation of QKD are discussed.