Lexmark MX718 Embedded Web Server--Security: Administrator s Guide - Page 44
Disk encryption
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Securing data 44 Disk encryption Enable hard disk encryption to prevent loss of sensitive data if the printer or its hard disk is stolen. When hard disk encryption is activated, the encryption key to be used (256-bit AES symmetric encryption) is pseudorandomly generated. This encryption key is stored in a proprietary way in the NV memory of the device. The hard disk is then reformatted with the encryption key. Any data on the disk is lost. The key, which is unique to the device, is not stored on the hard disk itself. So if the hard disk is removed from the device, then the contents of the hard disk are indecipherable. When an encrypted hard disk is moved to another supported device, the hard disk attempts to verify its encryption key with the device encryption key. Because the encryption key on the hard disk is different than the device encryption key, the verification fails. The device prompts to reformat the hard disk with a new encryption key, replacing the existing encrypted data on the hard disk. Note: Some printer models may not have a printer hard disk installed. Using the Embedded Web Server 1 Click Settings > Security > Disk Encryption. Note: Disk Encryption appears in the Security menu only when a formatted, working hard disk is installed. 2 From the Disk Encryption menu, select either of the following: • Disable-Disable disk encryption. • Enable-Enable disk encryption. Notes: - Disable is the factory default setting. - Changing this setting causes the printer to undergo a power‑on reset. Warning-Potential Damage: Changing the setting for disk encryption erases the contents of the hard disk. 3 Click Submit to proceed with disk encryption. Note: Encryption takes approximately two minutes. A status bar appears on the control panel indicating the progress of the disk encryption task. Warning-Potential Damage: Do not turn off the printer during the encryption process. 4 From the Web browser, refresh the page to return to the Embedded Web Server. Using the control panel 1 Turn off the printer. 2 While turning the printer on, press and hold down 2 and 6 simultaneously on the keypad until a progress bar appears. Note: Some printer models require you to press and hold down the check mark and the right arrow buttons. The printer performs a power-on reset, and then the Configuration menu appears. When the printer is fully turned on, a list of functions appears on the printer display. 3 Touch Disk Encryption > Enable > Yes.