linux-kernel - Re: [dm-crypt] [dm-devel] dm-crypt performance

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Date:	Tue, 09 Apr 2013 20:59:27 +0200
From:	Milan Broz <gmazyland@...il.com>
To:	Mikulas Patocka <mpatocka@...hat.com>
CC:	Milan Broz <gmazyland@...il.com>,
	Mike Snitzer <msnitzer@...hat.com>, dm-crypt@...ut.de,
	Christian Schmidt <schmidt@...add.de>,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>, dm-devel@...hat.com,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [dm-crypt] [dm-devel] dm-crypt performance

On 9.4.2013 20:08, Mikulas Patocka wrote:
> 
> 
> On Tue, 26 Mar 2013, Milan Broz wrote:
> 
>> - Are we sure we are not inroducing some another side channel in disc
>> encryption? (Unprivileged user can measure timing here).
>> (Perhaps stupid reason but please do not prefer performance to security
>> in encryption. Enough we have timing attacks for AES implementations...)
> 
> So use serpent - it is implemented without any data-dependent lookup 
> tables, so it has no timing attacks.

I wish using something different than AES is just such simple technical issue
for many people. But e.g. just try it in FIPS mode where AES is the only option:-)

Anyway, using bio_associate_current() seems to be the right way to try now...

Milan
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