From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from v1.tansi.org (mail.tansi.org [84.19.178.47]) by mail.server123.net (Postfix) with ESMTP for ; Fri, 27 Dec 2019 10:30:52 +0100 (CET) Received: from gatewagner.dyndns.org (81-6-44-245.init7.net [81.6.44.245]) by v1.tansi.org (Postfix) with ESMTPA id 1E3FB14005E for ; Fri, 27 Dec 2019 10:30:41 +0100 (CET) Date: Fri, 27 Dec 2019 10:30:51 +0100 From: Arno Wagner Message-ID: <20191227093050.GA5876@tansi.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Subject: Re: [dm-crypt] How to compress LUKS v2 header? List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: dm-crypt@saout.de Hi, compressing the anti-forensic stripes would require breaking some pretty impressive crypto. In short, for all practical purposes, compression is impossible. Regards, Arno On Thu, Dec 26, 2019 at 21:20:44 CET, Julio Cesar Faracco - jfaracco@br.ibm.com wrote: > 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! > > -- > Julio Cesar Faracco > _______________________________________________ > dm-crypt mailing list > dm-crypt@saout.de > https://www.saout.de/mailman/listinfo/dm-crypt -- 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 ---- A good decision is based on knowledge and not on numbers. -- Plato If it's in the news, don't worry about it. The very definition of "news" is "something that hardly ever happens." -- Bruce Schneier