US 12,339,984 B2
Management apparatus, control method, computer readable medium, and access control system
Takumi Hirota, Tokyo (JP); and Morimichi Kojima, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP); and NEC Solution Innovators, Ltd., Tokyo (JP)
Appl. No. 18/009,385
Filed by NEC Corporation, Tokyo (JP); and NEC Solution Innovators, Ltd., Tokyo (JP)
PCT Filed Jun. 11, 2020, PCT No. PCT/JP2020/023081
§ 371(c)(1), (2) Date Dec. 9, 2022,
PCT Pub. No. WO2021/250863, PCT Pub. Date Dec. 16, 2021.
Prior Publication US 2023/0222238 A1, Jul. 13, 2023
Int. Cl. G06F 21/00 (2013.01); G06F 21/60 (2013.01); G06F 21/62 (2013.01); H04L 9/08 (2006.01)
CPC G06F 21/6218 (2013.01) [G06F 21/602 (2013.01); H04L 9/0861 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A management apparatus comprising:
at least one memory that stores instructions; and
at least one processor that is configured to execute the instructions to:
acquire access right information from a server apparatus configured to manage the access right information, the access right information indicating an access right of a user for each file stored in an encrypted state in a first storage device;
put the acquired access right information in a second storage device;
acquire a request for key information that is used to decrypt a target file from a user apparatus operated by a target user;
determine, upon the acquisition of the request, whether or not the target user has an access right for the target file by using the access right information stored in the second storage device;
output the key information to the user apparatus when it is determined that the target user has the access right for the target file; and
when the access right information is updated in the server apparatus, update the access right information stored in the second storage device by acquiring the access right transmitted from the server apparatus.