CLIENT COMPUTER FOR PROTECTING CONFIDENTIAL FILE, SERVER COMPUTER THEREFOR, METHOD THEREFOR, AND COMPUTER PROGRAM

摘要

To implement service processes efficiently and safely by recognizing dependency between the service processes. The present invention provides a client computer for shielding a sensitive file. The client computer includes: an encryption-decryption unit for encrypting the sensitive file with an encryption key and decrypting the encrypted sensitive file with a decryption key corresponding to the encryption key, wherein an encryption key ID is embedded in the encrypted sensitive file, and the encryption key and the decryption key correspond to the encryption key ID; an encryption key storing unit for storing the encryption key; a decryption key storing unit for storing the decryption key; a compliance requirements storing unit that stores security compliance requirements of the client computer, wherein the security compliance requirements are sent from the server computer; and a security requirements monitoring unit for determining whether the client computer complies with the security compliance requirements or not in response to a read instruction or a write instruction of the sensitive file by application software, wherein when the client computer complies with the security compliance requirements, the security requirements monitoring unit passes the encryption key and the encryption key ID corresponding to the encryption key from the encryption key storing unit to the encryption-decryption unit in response to the write instruction, or passes the decryption key corresponding to the encryption key ID embedded in the encrypted sensitive file from the decryption key storing unit to the encryption-decryption unit in response to the read instruction. The present invention also provides a server computer that can connect to the client computer.