[dm-crypt] Using GCM mode with dm-crypt?

Arno Wagner arno at wagner.name
Fri Dec 31 15:29:06 CET 2010


Are you sure it is faster? Looks slower to me, especially as
paralellism in disk encryption should be done on sector-level
anyways. 

Also, it seems to require additional authentication data 
(the Tag t), which makes it unsuitable for 1:1 sector 
mapping. 

Arno


On Fri, Dec 31, 2010 at 02:14:14PM +0300, Igor Novgorodov wrote:
> From  what  i've  read  this  mode  is  faster  than  CBC  due to some
> parallelism,   and   it's   accelerated   by   newer   Intel's  PCLMUL
> instructions.
> 
> But it seems that AES/GCM mode is used only with IPSEC and such.
> 
> Is there any particular reason we cannot use it with disk encryption?
> 
> -- 
> ? ?????????,
>  Igor                          mailto:igor at novg.net
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-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno at wagner.name 
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