Quantum Secure Key Exchange with Position-based Credentials

• URL: http://arxiv.org/abs/2506.03549v1
• Date: Wed, 04 Jun 2025 04:08:44 GMT
• Title: Quantum Secure Key Exchange with Position-based Credentials
• Authors: Wen Yu Kon, Ignatius William Primaatmaja, Kaushik Chakraborty, Charles Lim,
• Abstract summary: Quantum key distribution (QKD) provides an information-theoretic way of securely exchanging secret keys.<n>To lift the requirement of pre-shared or public keys, Buhrman et. al. proposed utilizing the location of a party as a credential.<n>We develop a QKD protocol with location credentials using quantum position verification (QPV) based message and identity authentication.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum key distribution (QKD) provides an information-theoretic way of securely exchanging secret keys, and typically relies on pre-shared keys or public keys for message authentication. To lift the requirement of pre-shared or public keys, Buhrman et. al. [SIAM J. Comput. 43, 150 (2014)] proposed utilizing the location of a party as a credential. Here, we extend upon the proposal, develop a QKD protocol with location credentials using quantum position verification (QPV) based message and identity authentication. By using QKD with delayed authentication as a base, and later simplifying QPV-based message authentication, we significantly reduce the number of QPV runs, which currently acts as a bottleneck. Besides demonstrating security for the proposed protocol, we also provide improvements to QPV security analysis, including generalization of the QPV adversary model, tightening a trace distance bound using semidefinite programming, and propose a multi-basis QPV requiring only BB84 state preparation but with multiple measurement basis.

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