[dm-crypt] Cascading encryption how-to?

Falko fb1729 at posteo.de
Wed Jan 22 14:31:41 CET 2014


Thank you.

I also found this
http://thread.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/3357/focus=3358.

Regards
Falko

On 22.01.2014 00:56, Claudio Moretti wrote:
> (sorry, hit the wrong button)
> 
> It was proposed in a brainstorming session[1] in 2008, but AFAIK it's never been
> implemented.
> 
> I also found this[2] in which Milan said it's possible by creating LUKS over a
> LUKS device, but it's hell in terms of performance and you need to open every
> single device by itself (e.g. for aes-serpent-twofish you'd have to issue 3
> separate luksOpen commands).
> 
> Since it creates performance issues, it might be best for you to create a regular
> LUKS device for - say  your root filesystem and then, if you need it and your OS
> supports it, you can try
> 
> a) using /etc/crypttab to "luksOpen" a part of that already encrypted partition (I
> haven't tried, but it might be possible), or
> b) use Truecrypt to unlock encrypted files you keep somewhere.
> 
> Cheers,
> 
> Claudio
> 
> [1] http://code.google.com/p/cryptsetup/wiki/LUKSSpec20BrainStorming#Cascade_Ciphers
> [2] http://comments.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/3020
> 
> 
> On Tue, Jan 21, 2014 at 11:50 PM, Claudio Moretti <flyingstar16 at gmail.com
> <mailto:flyingstar16 at gmail.com>> wrote:
> 
>     It was proposed in a brainstorming session[1]
> 
> 
>     On Tue, Jan 21, 2014 at 8:59 PM, Falko <fb1729 at posteo.de
>     <mailto:fb1729 at posteo.de>> wrote:
> 
>         Hey there,
> 
>         I was wondering how I set up cascading encryption like in Truecrypt (e.g.
>         aes-twofish or even twofish-serpent-aes...). I tried this: cryptsetup -v -c
>         serpent-twofish-xts-plain64 -s 512 -h sha512 --verify-passphrase -y
>         --use-random
>         luksFormat /dev/sdx which, of course, didn't work :o). I couldn't find
>         anything in
>         the man or internet either - only that it should be possible :o).
> 
>         Thanks
> 
>         Kind regards
> 
>         fb
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> 
> 


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