US 12,003,624 B2
Quantum cryptographic communication system, key management inspection device, key management inspection method, and computer program product
Kazuaki Doi, Kawasaki Kanagawa (JP); Yoshimichi Tanizawa, Yokohama Kanagawa (JP); Toshiki Nakashima, Tokyo (JP); and Mari Matsumoto, Kawasaki Kanagawa (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed on Feb. 15, 2022, as Appl. No. 17/651,200.
Claims priority of application No. 2021-094118 (JP), filed on Jun. 4, 2021.
Prior Publication US 2022/0393864 A1, Dec. 8, 2022
Int. Cl. H04L 9/08 (2006.01)
CPC H04L 9/0852 (2013.01) 13 Claims
OG exemplary drawing
 
1. A quantum cryptographic communication system comprising:
a key integrated management device;
a plurality of quantum cryptography devices; and
a plurality of key management inspection devices, wherein
each of the plurality of key management inspection devices inspects a quantum cryptographic key generated by one of the plurality of quantum cryptography devices, and
each of the plurality of key management inspection devices includes 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 a 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 at 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 the key integrated management device.