What is quantum key management?
The limitations of quantum key distribution
Quantum key distribution (QKD) faces both implementation and destination limitation challenges. Regardless of the hardware used, signal attenuation between authorized parties limits the practical range of QKD to about 150km. Longer distances are possible, but require chaining multiple sender-receiver pairs, so managing end-to-end keys and optimizing route utilization in networks with multiple paths is crucial. This task falls to a quantum key management system (QKMS).
Operating QKD networks
QKD networks require dedicated systems to orchestrate and secure end-to-end key exchanges.
QKMS is the critical link between point-to-point quantum key distribution and scalable network security.
How QKMS boosts efficiency and security
In addition to essential functions, a quantum key management system improves QKD network efficiency and enhances security through features like secret sharing and path verification.
Quantum key management systems are a core component of QKD networks
QKD generates two symmetric keys between the sender and receiver, who are separated by no more than 150km. Deploying these network links requires trusted nodes, routing, key-relay functions and centralized end-to-end key management. The quantum key management system serves as the interface between QKD and the symmetric encryption applications. It bridges point-to-point QKD and full end-to-end encryption. Beyond its core tasks, it improves network efficiency and security through secret sharing and path verification.
Does QKMS require dedicated hardware?
Because quantum key management systems are primarily software-based, they can run virtually on existing infrastructure.
Quantum key management systems enable QKD at scale
A quantum key management system is essential for scalable, QKD-protected critical infrastructure. It enables end-to-end encryption beyond QKD’s point-to-point limitations and allows for a gradual rollout, interconnection of QKD domains and uniform, efficient operations. A quantum key management system is core to emerging QKD ecosystems and will play a critical role in future compliance and certification processes.
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