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This study presents the design and implementation of a QKD-based encryption system for securing specific user data traffic over 5G network backbone. Experimental results demonstrate the effectiveness and practical feasibility of the proposed QCF within 5G network environments.

In this paper, we describe a key routing method for large-scale quantum key distribution (QKD) networks. The proactive and dynamic key routing method decides the amount of key for distribution which is based on the key usage history of each application and stored key status of each link. Furthermore, we also propose a key routing method which applies multiple routing protocols according to the network domain of destination. The method provides key usage efficiently and promotes scalability for large-scale QKD networks.