	US 12,346,454 B2
	System, method, and non-transitory computer-readable medium
Takayuki Sasaki, Tokyo (JP); and Yusuke Shimada, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 18/007,779
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Jun. 5, 2020, PCT No. PCT/JP2020/022396 § 371(c)(1), (2) Date Dec. 2, 2022, PCT Pub. No. WO2021/245939, PCT Pub. Date Dec. 9, 2021.
Prior Publication US 2023/0229783 A1, Jul. 20, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 21/57 (2013.01)

CPC G06F 21/577 (2013.01) [G06F 2221/033 (2013.01)]

12 Claims

1. A system comprising:

a plurality of backdoor inspection devices;

a plurality of databases; and

a user device, wherein

each of the plurality of the backdoor inspection devices includes:

at least one backdoor-memory storing backdoor-instructions, and

at least one backdoor-processor configured to execute the backdoor-instructions to;

perform backdoor inspection on a prescribed software installed in a counterpart device that communicates with the user device and presume whether or not there is a backdoor in the prescribed software; and

issue a backdoor inspection certificate including a result of the backdoor inspection,

each of the plurality of the databases includes:

at least one database-memory storing database-instructions, and

at least one database-processor configured to execute the database-instructions to;

transmit the backdoor inspection certificate, and

the user device includes

at least one user-memory storing user-instructions, and

at least one user-processor configured to execute the user-instructions to;

acquire the backdoor inspection certificate from each of the plurality of the databases and determining, based on a plurality of the backdoor inspection certificates, whether or not communication with the counterpart device is permitted,

wherein

among the plurality of the backdoor inspection devices, a first backdoor inspection device performs the backdoor inspection on a part of the prescribed software,

among the plurality of the backdoor inspection devices, a second backdoor inspection device performs the backdoor inspection on a part of the prescribed software different from the part of the prescribed software on which the first backdoor inspection device performed the backdoor inspection, and

the second backdoor inspection device adds, to the result of inspection performed by the first backdoor inspection device on the part of the prescribed software, a result of inspection performed by the second backdoor inspection device, which is a result of the backdoor inspection performed on a part of the prescribed software different from the part of the prescribed software on which the first backdoor inspection device performed the backdoor inspection, and issues a second backdoor inspection certificate.