US 12,223,071 B2
Protecting device and protecting method
Kazumi Kinoshita, Tokyo (JP); Takeshi Nagayoshi, Tokyo (JP); and Kimihiro Yamakoshi, Tokyo (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/059,139
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed May 28, 2019, PCT No. PCT/JP2019/021080
§ 371(c)(1), (2) Date Nov. 25, 2020,
PCT Pub. No. WO2019/230715, PCT Pub. Date Dec. 5, 2019.
Claims priority of application No. 2018-104038 (JP), filed on May 30, 2018.
Prior Publication US 2021/0216659 A1, Jul. 15, 2021
Int. Cl. G06F 21/62 (2013.01); G06F 16/17 (2019.01)
CPC G06F 21/6218 (2013.01) [G06F 16/1727 (2019.01)] 7 Claims
OG exemplary drawing
 
6. A protection method comprising:
acquiring a list of file paths of predetermined protection target files, wherein the predetermined protection target files are immutable and are prevented from deletion; and
performing an operation of protecting data of a file corresponding to a file path included in the list, by processing circuitry;
detecting deletion of a link to the file;
querying the list for the file path to the file,
determining the file as among the predetermined protection target files according to the list based on the file path of the file;
restoring, in response to the determination of the file as among the predetermined protection target files based on the file path of the file, the link to the file; and
detecting access by a process to the file, wherein the access includes a request to opening the file when the file path of the accessed file path exists in the list while the file path of the execution file does not exist in the list;
in response to the detection access to the file, acquiring a combination of the file path of the accessed file and the file path of an execution file of the process of an access source; and
denying the request to opening the file.