Figure5

Figure 5. QKD application architecture. The secret keys generated by Alice and Bob are sent to their respective cloud computer via the ETSI GS QKD 014 REST API with the help of the key delivery link (black arrow) and the Ethernet link (brown arrow). These secret keys are stored in the internal SQLite3 database of the Q-VPN application. These stored keys are synced between the two points to encrypt the link between them. Once the Q-VPN link is established, a file transfer client/server application can be achieved. QKD: Quantum key distribution; Q-VPN: quantum-secured virtual private network.