Re: [dm-crypt] nuke password to delete luks header

[Milan Broz <gmazyland@gmail.com>]

On 01/14/2014 08:22 PM, .. ink .. wrote:
>  
> 
>     While I have not looked at it for some time, the last time I looked,
>     FAT did a create-at-end Strategy. This way the data "wanders" over
>     the partition towrds the end. ext2/3/4 will create files all over
>     the disk in the first place.
> 
> 
> My own tests have shown that with fat fs,files are not added randomly
> all over the disk and are added sequentially.Meaning,if the volume is
> used normally without exceeding a certain amount of disk space,the
> rest of the disk will remain untouched.

The whole hidden disk idea in TrueCrypt is based on this assumption,
and it works.

From "Filesystem Forensic Analysis" by Brian Carrier
(ISBN 978-0-321-26817-4), page 224, FAT allocation algorithms:

"The OS gets to choose which allocation algorithm it uses when it allocates
the clusters. I tested Windows98 and XP, and it appeared that a next available
algorithm was being used in both. The next available algorithm searches for
the first available cluster starting from the previously allocated cluster."

I think this will be very similar for other FAT implementations.

Milan