Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263654AbUDNPC6 (ORCPT ); Wed, 14 Apr 2004 11:02:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264246AbUDNPC6 (ORCPT ); Wed, 14 Apr 2004 11:02:58 -0400 Received: from mail4-141.ewetel.de ([212.6.122.141]:14984 "EHLO mail4.ewetel.de") by vger.kernel.org with ESMTP id S263654AbUDNPC5 (ORCPT ); Wed, 14 Apr 2004 11:02:57 -0400 To: Guillaume@Lacote.name Cc: linux-kernel@vger.kernel.org Subject: Re: Using compression before encryption in device-mapper In-Reply-To: <1KTfJ-5gK-25@gated-at.bofh.it> References: <1KykU-4VD-17@gated-at.bofh.it> <1KPvh-26S-7@gated-at.bofh.it> <1KSMw-4P1-13@gated-at.bofh.it> <1KTfJ-5gK-25@gated-at.bofh.it> Date: Wed, 14 Apr 2004 17:02:53 +0200 Message-Id: From: Pascal Schmidt X-CheckCompat: OK Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 855 Lines: 21 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/