[dm-crypt] recover old crypt partition

Arno Wagner arno at wagner.name
Thu Jan 6 15:14:25 CET 2011


On Thu, Jan 06, 2011 at 01:22:36PM +0100, Jan Christoph Uhde wrote:
> Hello,
> i'd like to recover an old encrypted partition:
>
> The following problems occur:
>
> * Only a big part of the password is known
> ** It has 17 or 19 signs 13 are known and 1 sing is perpended and 3  
> appended form a set of 5 candidates.

"sign"? Do you mean "character"? If so, 13 known, 6 unknown and
another 4 from 5 possibilities gives you 256^6 * 5^4  = 1.76*10^17
possibilities, which is a bit outside of what you can just try. 
Anything more known about the uunknowen ones?

> * The algorithem is unkown
> ** I guess it was the standard back in 2003 - 2005. I tried with the  
> last point from the FAQ - no luck so far

Is this plain dm-crypt?

> * I had to switch my terminal from utf8 to iso-8859-15 when i mounted my  
> disk the last times
> ** this is probably the biggest problem

That would surprise me. Seems rather trivial in comparison.

Well, I think this will require serious work and serious 
computation. 

Arno



> I am glad about any advice or script that might help me. The disk is one  
> of the last non-sata disks and i guess i should do it soon:)
>
> best regards,
> jan
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-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno at wagner.name 
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