Quantum cryptographic communication system, key management inspection device, key management inspection method, and computer program product

A key management inspection device that inspects a quantum cryptographic key generated by a quantum cryptography device, the key management inspection device comprising:

• one or more hardware processors configured to function at least as:
• an inspection-target-value calculating unit that calculates an inspection target value based on quantum cryptography device information related to the quantum cryptography device;
• an expected-value calculating unit that calculates an expected value based on at least one of
• the quantum cryptography device information,
• wiring information of a quantum cryptographic key distribution (QKD) link connected to the quantum cryptography device, and
• weather information of a site installed with the quantum cryptography device;
• a permissible-value calculating unit that calculates a permissible value based on at least one of the quantum cryptography device information, the wiring information, and the weather information;
• and
• a determining unit that
• determines whether or not the inspection target value is within a range of (the expected value)−(the permissible value) and within a range of (the expected value)+(the permissible value), and
• when the inspection target value is outside the range of (the expected value)−(the permissible value) and outside the range of (the expected value)+(the permissible value), transmits anomaly detection to a key integrated management device.

A computer program product having a non-transitory computer readable medium including programmed instructions, wherein the instructions, when executed by a computer that inspects a quantum cryptographic key generated by a quantum cryptography device, cause the computer to function as:

• an inspection-target-value calculating unit that calculates an inspection target value based on quantum cryptography device information related to the quantum cryptography device;
• an expected-value calculating unit that calculates an expected value based on at least one of
• wiring information of a quantum cryptographic key distribution (QKD) link connected to the quantum cryptography device to be inspected,
• weather information of a site installed with the quantum cryptography device to be inspected, and
• the quantum cryptography device information;
• a permissible-value calculating unit that calculates a permissible value based on at least one of the wiring information, the weather information, and the quantum cryptography device information;
• and
• a determining unit that
• determines whether or not the inspection target value is within a range of (the expected value)−(the permissible value) and within a range of (the expected value)+(the permissible value), and
• when the inspection target value is outside the range of (the expected value)−(the permissible value) and outside the range of (the expected value)+(the permissible value), transmits anomaly detection to a key integrated management device.