From: Pascal Schmidt <der.eremit@email.de>
To: Guillaume@Lacote.name
Cc: linux-kernel@vger.kernel.org
Subject: Re: Using compression before encryption in device-mapper
Date: Wed, 14 Apr 2004 17:02:53 +0200 [thread overview]
Message-ID: <E1BDluf-00007s-PB@localhost> (raw)
In-Reply-To: <1KTfJ-5gK-25@gated-at.bofh.it>
On Wed, 14 Apr 2004 16:10:20 +0200, you wrote in linux.kernel:
> Actually (see my reply to Timothy Miller) I really want to do "compression"
> even if it does not reduce space: it is a matter of growing the per-bit
> entropy rather than to gain space (see http://jsam.sourceforge.net).
How is the per-bit entropy higher when the same amount of data (and
thus entropy on that data) is sometimes contained in *more* bits?
I can see the argument if data is really compressed, because then more
bits than would normally fit into, say, a sector, contribute to the
entropy of the final sector.
--
Ciao,
Pascal
next parent reply other threads:[~2004-04-14 15:02 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1KykU-4VD-17@gated-at.bofh.it>
[not found] ` <1KPvh-26S-7@gated-at.bofh.it>
[not found] ` <1KSMw-4P1-13@gated-at.bofh.it>
[not found] ` <1KTfJ-5gK-25@gated-at.bofh.it>
2004-04-14 15:02 ` Pascal Schmidt [this message]
2004-04-14 15:25 ` Using compression before encryption in device-mapper Guillaume Lacôte
2004-04-14 19:29 ` Pascal Schmidt
2004-04-13 15:44 Guillaume Lacôte
2004-04-13 16:57 ` Timothy Miller
2004-04-14 6:48 ` Guillaume Lacôte
2004-04-13 17:45 ` Jörn Engel
2004-04-13 19:42 ` Ville Herva
2004-04-14 6:54 ` Guillaume Lacôte
2004-04-14 9:43 ` Jörn Engel
2004-04-14 10:02 ` Guillaume Lacôte
2004-04-14 11:25 ` Jörn Engel
2004-04-14 12:44 ` Paulo Marques
2004-04-14 13:34 ` Jörn Engel
2004-04-14 13:58 ` maccorin
2004-04-14 14:02 ` Guillaume Lacôte
2004-04-14 14:39 ` Grzegorz Kulewski
2004-04-14 15:07 ` Guillaume Lacôte
2004-04-14 16:14 ` Grzegorz Kulewski
2004-04-14 15:23 ` Paulo Marques
2004-04-14 15:32 ` Guillaume Lacôte
2004-04-14 17:25 ` Bill Davidsen
2004-04-15 9:28 ` Jörn Engel
2004-04-22 7:59 ` Guillaume Lacôte
2004-04-22 9:18 ` Jörn Engel
2004-04-22 10:20 ` Guillaume Lacôte
2004-04-22 12:15 ` Jörn Engel
2004-04-22 13:06 ` Guillaume Lacôte
2004-04-22 16:00 ` Jörn Engel
2004-04-23 15:16 ` Guillaume Lacôte
2004-04-23 16:57 ` Jörn Engel
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