[dm-crypt] Efficacy of xts over 1TB

Arno Wagner arno at wagner.name
Tue Jul 27 00:55:18 CEST 2010

On Mon, Jul 26, 2010 at 11:42:37PM +0200, Christoph Anton Mitterer wrote:
> Well....
> I've just read some sections of the Standard... D4 and D6... it rather
> seems that really the whole size (of the partition) is meant,... and not
> just the block size... although they speak of ranges > 100 TB
> *confused now*
> Cheers,
> Chris.

I suspect that comes from only 2^128 possible cipher blocks and the
birthday paradox which would give you the same cipher block twice
when having around 2^64 blocks (modelled as random).

Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno at wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier 

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