Related papers: Secure and practical Quantum Digital Signatures

Secure and practical Quantum Digital Signatures

URL: http://arxiv.org/abs/2508.05355v1
Date: Thu, 07 Aug 2025 13:03:43 GMT
Title: Secure and practical Quantum Digital Signatures
Authors: Federico Grasselli, Gaetano Russo, Massimiliano Proietti,
Abstract summary: Quantum Digital Signatures (QDS) can offer solutions that are information-theoretically (IT) secure and thus immune to quantum attacks.<n>We analyze three existing practical QDS protocols based on preshared secure keys and universal hashing families.<n>We numerically optimize the protocol parameters to improve efficiency in terms of preshared bit consumption and signature length.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Digital signatures represent a crucial cryptographic asset that must be protected against quantum adversaries. Quantum Digital Signatures (QDS) can offer solutions that are information-theoretically (IT) secure and thus immune to quantum attacks. In this work, we analyze three existing practical QDS protocols based on preshared secure keys (e.g., established with quantum key distribution) and universal hashing families. For each protocol, we make amendments to close potential loopholes and prove their IT security while accounting for the failure of IT-secure authenticated communication. We then numerically optimize the protocol parameters to improve efficiency in terms of preshared bit consumption and signature length, allowing us to identify the most efficient protocol.

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