Topology-Hiding Connectivity-Assurance for QKD Inter-Networking

• URL: http://arxiv.org/abs/2604.01876v1
• Date: Thu, 02 Apr 2026 10:30:43 GMT
• Title: Topology-Hiding Connectivity-Assurance for QKD Inter-Networking
• Abstract summary: We introduce a topology-hiding connectivity assurance protocol to enhance trust in quantum key distribution networks.<n>Our protocol allows network providers to jointly prove the existence of a secure connection between endpoints without revealing internal topology details.
• Score: 0.15293427903448018
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: While QKD ensures information-theoretic security at the link level, real-world deployments depend on trusted repeaters, creating potential vulnerabilities. In this paper, we thus introduce a topology-hiding connectivity assurance protocol to enhance trust in quantum key distribution (QKD) network infrastructures. Our protocol allows network providers to jointly prove the existence of a secure connection between endpoints without revealing internal topology details. By extending graph-signature techniques to support multi-graphs and hidden endpoints, we enable zero-knowledge proofs of connectivity that ensure both soundness and topology hiding. We further discuss how our approach can certify, e.g., multiple disjoint paths, supporting multi-path QKD scenarios. This work bridges cryptographic assurance methods with the operational requirements of QKD networks, promoting verifiable and privacy-preserving inter-network connectivity.

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