[dm-crypt] dm-crypt vs Luks: What’s the difference on disk

[dm-crypt] dm-crypt vs Luks: What’s the difference on disk

[Michael]

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Hi,

I was wondering why a plain dm-crypt partition looks like random data  
while with a Luks partition an attacker will know that the partition  
is encrypted. What is exactly the difference on disk? Is it the header  
that would tell someone thats an encrypted partition? Would a Luks  
partition with a detached header change this situation?

Thanks.
-- 
Regards,
Michael

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Re: [dm-crypt] dm-crypt vs Luks: What’s the difference on disk

[Arno Wagner]

Simple: plain dm-crypt is header-less.
More info in the FAQ, Section 6, in particular Items
6.11 and 6.12.

Arno


On Tue, Aug 12, 2014 at 15:11:18 CEST, Michael wrote:
> 
> Hi,
> 
> I was wondering why a plain dm-crypt partition looks like random
> data while with a Luks partition an attacker will know that the
> partition is encrypted. What is exactly the difference on disk? Is
> it the header that would tell someone thats an encrypted partition?
> Would a Luks partition with a detached header change this situation?
> 
> Thanks.
> -- 
> Regards,
> Michael

> pub  2048R/CF8EDAA3 2014-06-04 Michael G <michael@skrilnetz.net>
> sub  2048R/28ADE1E3 2014-06-04

> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt


-- 
Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno@wagner.name
GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
----
A good decision is based on knowledge and not on numbers. -  Plato

Re: [dm-crypt] dm-crypt vs Luks: What’s the difference on disk

[Michael]

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So a Luks partition with a detached header would look the same as a  
plain dm-crypt partition, right?
Quoting Arno Wagner <arno@wagner.name>:

> Simple: plain dm-crypt is header-less.
> More info in the FAQ, Section 6, in particular Items
> 6.11 and 6.12.
>
> Arno
>
>
> On Tue, Aug 12, 2014 at 15:11:18 CEST, Michael wrote:
>>
>> Hi,
>>
>> I was wondering why a plain dm-crypt partition looks like random
>> data while with a Luks partition an attacker will know that the
>> partition is encrypted. What is exactly the difference on disk? Is
>> it the header that would tell someone thats an encrypted partition?
>> Would a Luks partition with a detached header change this situation?
>>
>> Thanks.
>> --
>> Regards,
>> Michael
>
>> pub  2048R/CF8EDAA3 2014-06-04 Michael G <michael@skrilnetz.net>
>> sub  2048R/28ADE1E3 2014-06-04
>
>> _______________________________________________
>> dm-crypt mailing list
>> dm-crypt@saout.de
>> http://www.saout.de/mailman/listinfo/dm-crypt
>
>
> --
> Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno@wagner.name
> GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
> ----
> A good decision is based on knowledge and not on numbers. -  Plato
> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt


-- 
Regards,
Michael

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Re: [dm-crypt] dm-crypt vs Luks: What’s the difference on disk

[Arno Wagner]

It should. You can try on a loop-file to be sure.

Arno

On Tue, Aug 12, 2014 at 21:03:17 CEST, Michael wrote:
> So a Luks partition with a detached header would look the same as a
> plain dm-crypt partition, right?
> Quoting Arno Wagner <arno@wagner.name>:
> 
> >Simple: plain dm-crypt is header-less.
> >More info in the FAQ, Section 6, in particular Items
> >6.11 and 6.12.
> >
> >Arno
> >
> >
> >On Tue, Aug 12, 2014 at 15:11:18 CEST, Michael wrote:
> >>
> >>Hi,
> >>
> >>I was wondering why a plain dm-crypt partition looks like random
> >>data while with a Luks partition an attacker will know that the
> >>partition is encrypted. What is exactly the difference on disk? Is
> >>it the header that would tell someone thats an encrypted partition?
> >>Would a Luks partition with a detached header change this situation?
> >>
> >>Thanks.
> >>--
> >>Regards,
> >>Michael
> >
> >>pub  2048R/CF8EDAA3 2014-06-04 Michael G <michael@skrilnetz.net>
> >>sub  2048R/28ADE1E3 2014-06-04
> >
> >>_______________________________________________
> >>dm-crypt mailing list
> >>dm-crypt@saout.de
> >>http://www.saout.de/mailman/listinfo/dm-crypt
> >
> >
> >--
> >Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno@wagner.name
> >GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
> >----
> >A good decision is based on knowledge and not on numbers. -  Plato
> >_______________________________________________
> >dm-crypt mailing list
> >dm-crypt@saout.de
> >http://www.saout.de/mailman/listinfo/dm-crypt
> 
> 
> -- 
> Regards,
> Michael

> pub  2048R/CF8EDAA3 2014-06-04 Michael G <michael@skrilnetz.net>
> sub  2048R/28ADE1E3 2014-06-04

> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt


-- 
Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno@wagner.name
GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
----
A good decision is based on knowledge and not on numbers. -  Plato