Reliability-Guided Trusted Repeater Node Selection in QKD-Enabled Metro Optical Networks

2026-09-16

AI Summary

该研究通过贝叶斯融合模型量化节点可信度，并使用Dijkstra算法选择可信中继节点，以提高QKD城域光网络的路径覆盖率和安全性。

Abstract

Quantum Key Distribution (QKD) in optical networks can provide information-theoretic security but is limited by its operability range, thereby requiring repeater nodes for extended coverage. Existing works typically assume that all repeater nodes and their associated key management systems are fully trusted, overlooking the risks posed by software exploits and insider threats. To address this, in this work, we propose a Bayesian fusion-based model to quantify the trustworthiness of each node. We have formulated a reliability-guided Trusted Repeater Node (TRN) selection framework for metro optical networks, where each node is assigned a trust score. We have subsequently mapped this trust score to link weights, which in turn has been used for reliable path computation for TRN selection, using the Dijkstra algorithm. We have also ranked the nodes using a composite score combining eigenvector and betweenness centrality, to capture their topographical relevance in the network. Simulation results on a reference topology demonstrate that the proposed method achieves approximately 8.93% higher path coverage than traditional centrality-based approaches like degree centrality, using the same number (around ten) of TRNs, thereby supporting reliable and resilient TRN selection for QKD-enabled optical networks.

Problem

• Quantum Key Distribution
• Trusted Repeater Node
• Bayesian fusion
• Reliability
• Optical Networks

Innovation

• Bayesian fusion
• reliability-guided TRN selection
• trust score
• Dijkstra algorithm
• composite centrality score