Hedwig Koerfgen

Quantum Key Distribution (QKD) networks form a multi-layer cyber-physical infrastructure in which quantum-optical systems interact with classical devices, creating security dependencies that are not captured by protocol-level analyses. We present a structured approach for systematic security engineering of QKD networks that introduces stakeholder-centered risk views linked to established cybersecurity methods. Applied to a metropolitan QKD network, the framework connects quantum security assumptions with threat analysis, and supports practical security assessments for network operators.