FOG data wiping algorithms

[Wiping4TheWin]

Hello,

For some compliance needs, I’m looking for technical details regarding used data wiping algorithms by FOG. Could you please be more precise as below :

• Simple Overwrite with 1 pass
• DOD 5220.22-M with 3 passes
• Gutmann with 35 passes

According to the official documentation, I only found this section here : https://wiki.fogproject.org/wiki/index.php?title=Managing_FOG#Advanced_Tasks

Fast Wipe :
This task does a quick and dirty wipe of the drive. This task writes zeros to the first ~40MB of the disk. This task should NOT be used if you don’t want your data to be recoverable.

Normal Wipe :
This tasks writes random data to the entire surface area of the disk.

Full Wipe :
This tasks writes random data, multiple times to the entire surface of the disk.

Thank you for your help !

[george1421]

@wiping4thewin If you are doing this for compliance reasons, you might consider booting dban from your FOG server to have a compliant DoD approved wipe.

Let me look in the code to see what is going on.

[george1421]

@wiping4thewin For normal and full wipe FOG uses the shred utility https://linux.die.net/man/1/shred

ref: https://github.com/FOGProject/fos/blob/aa85a918cbe1c5262cefe8cdc459cdac22aca409/Buildroot/board/FOG/FOS/rootfs_overlay/bin/fog.wipe#L14

[Wiping4TheWin]

@george1421 : Thank a lot for your fast && accurate answer. Have a nice day !