Quantum security key offline distribution system, method and device

The invention discloses a quantum security key offline distribution system, method and device. The key distributor and the quantum security device pass the bidirectional identity authentication, so that the security of quantum security key distribution is ensured. A physical connection mode is adopted between the key distributor and the quantum security equipment, so that the key is safely distributed to the quantum security equipment without real-time network communication, the secure transmission and confidentiality of the key are ensured, and potential attackers are prevented from acquiring the key or tampering the key in the network communication process. The quantum security device feeds back the key information to the key distributor, so that the key distributor timely knows the state of the quantum security device, accurately determines the key quantity of the key required by the quantum security device and distributes the supplementary key to the quantum security device. It is ensured that the quantum