[dm-crypt] solved: Re: How to recover partially overwritten LUKS volume?

Arno Wagner arno at wagner.name
Mon Aug 27 13:45:13 CEST 2012

On Mon, Aug 27, 2012 at 12:20:28PM +0200, Milan Broz wrote:
> On 08/27/2012 11:51 AM, Andr?s Korn wrote:
> > That means that the offsets from the FAQ don't apply to my LUKS
> > container and that keyslot #2 has been wiped after all.
> Not sure if it is good idea to have these in FAQ, it depends on
> key size. (But there are usually only 3 variants for 128,256 and 512bits).

I use 64 in "smalles possible LUKS container", but 64 is
basically always insecure today.
> I wonder adding this directly to luksDump would help?
> Like
> 	...
>         Key material offset:    8
> 	Key slot area offset:   0x1000 - 0x21000
> 	...
> (here with padding, perhaps it is better print used area only without padding...)

Best would be to dump where everything actually is, maybe
even with sector-numbers added and total size.

Then I can do one example in the FAQ (the one already there) and 
say that padding, offsets, different key-sizes and modes (XTS), 
different versions of cryptsetup on creation, etc. can all shift 
these and refer to luksDump. That would also cover all future 

Arno Wagner,    Dr. sc. techn., Dipl. Inform.,   Email: arno at wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
One of the painful things about our time is that those who feel certainty 
are stupid, and those with any imagination and understanding are filled 
with doubt and indecision. -- Bertrand Russell 

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