| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a data management device high in security protection capability and capable of immediately reproducing an encryption key even if the encryption key is damaged. <P>SOLUTION: A control unit reads out a key (A) from an NVRAM 3, encrypts it by using a key (B), and writes it in an HDD 4 as a key (A1) when initializing the HDD 4. When job data are inputted from a host computer to the control unit via a communication part, the control unit encrypts the job data by using the key (A) in the NVRAM 3 and writes them in the HDD 4. When printing the job data in the HDD 4, the control unit reads out the encrypted job data in the HDD 4, decrypts them by using the key (A), and outputs them to an image forming part. When the key (A) is damaged due to errors in operation or the like, the control unit reads out the key (A1) from the HDD 4, decrypts it, and writes it in the NVRAM 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
