Re: [dm-crypt] How to compress LUKS v2 header?

["Julio Cesar Faracco - jfaracco@br.ibm.com" <jfaracco@br.ibm.com>]

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Hi guys!

Thanks for your answers and sorry to send a lots of cloned emails.
I got issues to send for some reason.

Anyway, we have a lab here and we usually save the backup header for security reasons.
But after moving to LUKS v2 from v1, header increased from ~1MB to ~22MB.

We would not like to remove some important features introduced by v2.

--     
Julio  Cesar Faracco

From: dm-crypt <dm-crypt-bounces@saout.de> on behalf of Arno Wagner <arno@wagner.name>
Sent: Friday, December 27, 2019 6:30 AM
To: dm-crypt@saout.de
Subject: [EXTERNAL] Re: [dm-crypt] How to compress LUKS v2 header?
    
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
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-- 
Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno@wagner.name
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