FILE CIPHERING BACKUP METHOD AND SYSTEM DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a file ciphering backup method by which a contents cannot be decoded even if the backup file of a file server is viewed by a third person and to provide a system device. SOLUTION: A writing monitor part 15 which constantly monitors the outputting of an instruction on the preservation of file data Dn attended with the update processing of a file from an application 11 introduced to a personal computer 1 and reads file data Dn accumulated in the buffer 12a of an HD writing processing part 12 when the instruction is outputted, a chipher processing part 17 operating a common key ciphering function (f) where a cryptographic key Xi which is peculiarly set in an IC card 5 is set to be a parameter with respect to file data Dn that is read from the HD writing processing part 12 and a server writing processing part 18 transmitting ciphered file data Pin generated in the chipher processing part 17 to a file server 3 via LAN 2 are provided.