| 摘要 |
A data encryption device (102) is connected between an HDD (103) and an HDD controller (101) that controls the HDD. The data encryption device encrypts data that is stored from the HDD controller to the HDD, and decrypts data that is read from the HDD. A CPU (106) of the data encryption device receives a command issued from the HDD controller to the HDD, and determines whether the command is executable at the HDD. When it is determined that the command is executable, the command is issued to the HDD. On the other hand, when it is determined that the command is unexecutable, the CPU prohibits issuance of the command to the HDD. Furthermore, when a command issued to the HDD is a specific command, the CPU bypasses data transferred between the HDD controller and the HDD without encryption or decryption. |
