Disk Encryption - Lexmark C54x Administrator's Manual

Securing data

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 pseudo-randomly
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 will erase 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.
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