From: Arno Wagner <arno@wagner.name>
To: dm-crypt@saout.de
Subject: Re: [dm-crypt] [dm-devel] dm-crypt performance
Date: Mon, 22 Apr 2013 04:28:04 +0200 [thread overview]
Message-ID: <20130422022804.GA18605@tansi.org> (raw)
In-Reply-To: <1366576716.4048.13.camel@hidalgo>
On Sun, Apr 21, 2013 at 10:38:36PM +0200, Yves-Alexis Perez wrote:
> On mar., 2013-04-09 at 20:40 +0200, Arno Wagner wrote:
> > > AES uses data-dependent lookup tables, on CPU with hyperthreding, the
> > > second thread can observe L1 cache footprint done by the first thread and
> > > get some information about data being encrypted...
> >
> > Yes, but that is not the only potential problem. For example, with
> > Intel now implementing voltage regulators on the CPU, we may
> > even see power-usage based leaks. If you are paranoid, constant
> > time-contant-power implementations are the only solution. And
> > while feasible, they are sloooooooowwwwww...
>
> Note that on those CPUs AES should usually use AES-NI so timing attacks
> using the cache should not be that relevant…
I should point out that I talk about "power" and not "time".
Arno
--
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
----
There are two ways of constructing a software design: One way is to make it
so simple that there are obviously no deficiencies, and the other way is to
make it so complicated that there are no obvious deficiencies. The first
method is far more difficult. --Tony Hoare
next prev parent reply other threads:[~2013-04-22 2:28 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-26 3:47 dm-crypt performance Mikulas Patocka
2013-03-26 6:52 ` Christoph Hellwig
2013-03-26 12:27 ` [dm-crypt] [dm-devel] " Alasdair G Kergon
2013-03-26 12:27 ` Alasdair G Kergon
2013-03-26 20:05 ` [dm-crypt] " Milan Broz
2013-03-26 20:05 ` Milan Broz
2013-03-26 20:28 ` [dm-crypt] " Mike Snitzer
2013-03-26 20:28 ` Mike Snitzer
2013-03-26 20:58 ` [dm-crypt] " Milan Broz
2013-03-26 20:58 ` Milan Broz
2013-03-28 18:53 ` [dm-crypt] " Tejun Heo
2013-03-28 18:53 ` Tejun Heo
2013-03-28 19:33 ` [dm-crypt] " Vivek Goyal
2013-03-28 19:33 ` Vivek Goyal
2013-03-28 19:44 ` [dm-crypt] " Tejun Heo
2013-03-28 19:44 ` Tejun Heo
2013-03-28 20:38 ` [dm-crypt] " Vivek Goyal
2013-03-28 20:38 ` Vivek Goyal
2013-03-28 20:45 ` Tejun Heo
2013-04-09 17:51 ` [dm-crypt] dm-crypt parallelization patches Mikulas Patocka
2013-04-09 17:51 ` Mikulas Patocka
2013-04-09 17:57 ` Tejun Heo
2013-04-09 18:08 ` [dm-crypt] " Mikulas Patocka
2013-04-09 18:08 ` Mikulas Patocka
2013-04-09 18:10 ` Tejun Heo
2013-04-09 18:42 ` [dm-crypt] " Vivek Goyal
2013-04-09 18:42 ` Vivek Goyal
2013-04-09 18:57 ` Tejun Heo
2013-04-09 19:13 ` [dm-crypt] " Vivek Goyal
2013-04-09 19:13 ` Vivek Goyal
2013-04-09 19:42 ` [dm-crypt] " Mikulas Patocka
2013-04-09 19:42 ` Mikulas Patocka
2013-04-09 19:52 ` Tejun Heo
2013-04-09 20:32 ` [dm-crypt] " Mikulas Patocka
2013-04-09 20:32 ` Mikulas Patocka
2013-04-09 21:02 ` Tejun Heo
2013-04-09 21:03 ` Tejun Heo
2013-04-09 21:07 ` [dm-crypt] " Vivek Goyal
2013-04-09 21:07 ` Vivek Goyal
2013-04-09 21:18 ` [dm-crypt] " Mikulas Patocka
2013-04-09 21:18 ` Mikulas Patocka
2013-04-10 19:24 ` [dm-crypt] " Vivek Goyal
2013-04-10 19:24 ` Vivek Goyal
2013-04-10 23:42 ` [dm-crypt] [PATCH] make dm and dm-crypt forward cgroup context (was: dm-crypt parallelization patches) Mikulas Patocka
2013-04-10 23:42 ` Mikulas Patocka
2013-04-10 23:50 ` Tejun Heo
2013-04-11 19:49 ` [dm-crypt] [PATCH v2] " Mikulas Patocka
2013-04-11 19:49 ` Mikulas Patocka
2013-04-11 19:52 ` Tejun Heo
2013-04-11 20:00 ` Tejun Heo
2013-04-12 0:06 ` [dm-crypt] " Mikulas Patocka
2013-04-12 0:06 ` Mikulas Patocka
2013-04-12 0:22 ` Tejun Heo
2013-04-12 5:59 ` [dm-crypt] [PATCH v2] make dm and dm-crypt forward cgroup context Milan Broz
2013-04-12 5:59 ` Milan Broz
2013-04-12 18:17 ` [dm-crypt] [PATCH v2] make dm and dm-crypt forward cgroup context (was: dm-crypt parallelization patches) Mikulas Patocka
2013-04-12 18:17 ` Mikulas Patocka
2013-04-12 18:01 ` [dm-crypt] " Mikulas Patocka
2013-04-12 18:01 ` Mikulas Patocka
2013-04-12 18:29 ` Tejun Heo
2013-04-15 13:02 ` [dm-crypt] " Mikulas Patocka
2013-04-15 13:02 ` Mikulas Patocka
2013-04-16 17:24 ` Tejun Heo
2013-04-16 19:41 ` [dm-crypt] " Mikulas Patocka
2013-04-16 19:41 ` Mikulas Patocka
2013-04-18 16:47 ` [dm-crypt] " Mike Snitzer
2013-04-18 16:47 ` Mike Snitzer
2013-04-18 17:03 ` Tejun Heo
2013-05-22 18:50 ` [dm-crypt] " Mike Snitzer
2013-05-22 18:50 ` Mike Snitzer
2013-05-22 19:48 ` Tejun Heo
2013-04-09 18:36 ` [dm-crypt] dm-crypt parallelization patches Vivek Goyal
2013-04-09 18:36 ` Vivek Goyal
2013-04-09 18:08 ` [dm-crypt] [dm-devel] dm-crypt performance Mikulas Patocka
2013-04-09 18:08 ` Mikulas Patocka
2013-04-09 18:08 ` Mikulas Patocka
2013-04-09 18:40 ` [dm-crypt] " Arno Wagner
2013-04-21 20:38 ` Yves-Alexis Perez
2013-04-22 2:28 ` Arno Wagner [this message]
2013-04-09 18:59 ` Milan Broz
2013-04-09 18:59 ` Milan Broz
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