From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <jfaracco@br.ibm.com>
Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com
 [148.163.156.1])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (No client certificate requested)
 by mail.server123.net (Postfix) with ESMTPS
 for <dm-crypt@saout.de>; Thu, 26 Dec 2019 21:41:03 +0100 (CET)
Received: from pps.filterd (m0098404.ppops.net [127.0.0.1])
 by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id
 xBQKGuIp069336
 for <dm-crypt@saout.de>; Thu, 26 Dec 2019 15:20:47 -0500
Received: from ppma03wdc.us.ibm.com (ba.79.3fa9.ip4.static.sl-reverse.com
 [169.63.121.186])
 by mx0a-001b2d01.pphosted.com with ESMTP id 2x21snccek-1
 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT)
 for <dm-crypt@saout.de>; Thu, 26 Dec 2019 15:20:47 -0500
Received: from pps.filterd (ppma03wdc.us.ibm.com [127.0.0.1])
 by ppma03wdc.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id xBQKKWwt018275
 for <dm-crypt@saout.de>; Thu, 26 Dec 2019 20:20:46 GMT
Received: from b03cxnp08026.gho.boulder.ibm.com
 (b03cxnp08026.gho.boulder.ibm.com [9.17.130.18])
 by ppma03wdc.us.ibm.com with ESMTP id 2x1b16ujar-1
 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT)
 for <dm-crypt@saout.de>; Thu, 26 Dec 2019 20:20:46 +0000
Received: from b03ledav005.gho.boulder.ibm.com
 (b03ledav005.gho.boulder.ibm.com [9.17.130.236])
 by b03cxnp08026.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id
 xBQKKjAi61407618
 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK)
 for <dm-crypt@saout.de>; Thu, 26 Dec 2019 20:20:45 GMT
Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1])
 by IMSVA (Postfix) with ESMTP id 75215BE053
 for <dm-crypt@saout.de>; Thu, 26 Dec 2019 20:20:45 +0000 (GMT)
Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1])
 by IMSVA (Postfix) with ESMTP id 5588ABE04F
 for <dm-crypt@saout.de>; Thu, 26 Dec 2019 20:20:45 +0000 (GMT)
Received: from mail.gmx.ibm.com (unknown [9.209.244.200])
 by b03ledav005.gho.boulder.ibm.com (Postfix) with ESMTPS
 for <dm-crypt@saout.de>; Thu, 26 Dec 2019 20:20:45 +0000 (GMT)
From: "Julio Cesar Faracco - jfaracco@br.ibm.com" <jfaracco@br.ibm.com>
Date: Thu, 26 Dec 2019 20:20:44 +0000
Message-ID: <fbd7b3b7e45a48d7896cb3b644fd86bb@br.ibm.com>
Content-Language: en-US
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Subject: [dm-crypt] How to compress LUKS v2 header?
List-Id: <dm-crypt.saout.de>
List-Unsubscribe: <https://www.saout.de/mailman/options/dm-crypt>,
 <mailto:dm-crypt-request@saout.de?subject=unsubscribe>
List-Archive: <https://www.saout.de/pipermail/dm-crypt/>
List-Post: <mailto:dm-crypt@saout.de>
List-Help: <mailto:dm-crypt-request@saout.de?subject=help>
List-Subscribe: <https://www.saout.de/mailman/listinfo/dm-crypt>,
 <mailto:dm-crypt-request@saout.de?subject=subscribe>
To: "dm-crypt@saout.de" <dm-crypt@saout.de>

Hi all,

I'm trying to compress a LUKS v2 header file, but I'm not seeing any
sensible reduction.
I'm using `cryptsetup luksHeaderBackup /dev/sda2 --header-backup-file /tmp/=
backup.header`
I used ZIP and GZIP, but I got 0% of reduction of `backup.header`. :-(
Do you have any suggestions of what algorithm should be used to
compress this type of file?

Thanks!

--    =20
Julio  Cesar Faracco=