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arXiv · 1109.2844

Using Hash-Based Signatures to Bootstrap Quantum Key Distribution

Sébastien Kunz-Jacques·Paul Jouguet
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Abstract

Quantum Key Distribution is a secret distribution technique that requires an authenticated channel. This channel is usually created on top of an un-authenticated communication medium using unconditionally secure Message Authentication Codes (MAC) and an initial common secret. We examine the consequences of replacing this MAC algorithm by a cryptographic hash-based signature algorithm, like the Lamport algorithm. We show that provided one-way functions exist, the Lamport algorithm or its variants can be instantiated in a secure way in the Universally Composable sense, and can therefore be plugged into any QKD protocol with a composable security proof in a secure manner. This association, while relying on short-term computational hardness assumptions, results in an increase of the practical security of QKD and eases its deployment.

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Sébastien Kunz-Jacques, Paul Jouguet. 2013-07-25. Using Hash-Based Signatures to Bootstrap Quantum Key Distribution. https://arxiv.org/abs/1109.2844

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