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@xxxxxxxx> on behalf of Arno Wagner <arno@xxxxxxxxxxx> Sent: Friday, December 27, 2019 6:30 AM To: dm-crypt@xxxxxxxx Subject: [EXTERNAL] Re: 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@xxxxxxxxxx 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@xxxxxxxx > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.saout.de_mailman_listinfo_dm-2Dcrypt&d=DwICAg&c=jf_iaSHvJObTbx-siA1ZOg&r=ZRo7ioNm6-KW9XMwc8-3Aqc6TBVFd8_9yk27A36m0u0&m=UHeTRaj2fJOS8eofLbCuddNDYr5YBFfte5x52g8cOh0&s=whK0QtntH0C5Yob4nwEPjwFCu8n7NZirV09FpwE_pbg&e= -- Arno Wagner, Dr. sc. techn., Dipl. Inform., Email: arno@xxxxxxxxxxx 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 _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx https://urldefense.proofpoint.com/v2/url?u=https-3A__www.saout.de_mailman_listinfo_dm-2Dcrypt&d=DwICAg&c=jf_iaSHvJObTbx-siA1ZOg&r=ZRo7ioNm6-KW9XMwc8-3Aqc6TBVFd8_9yk27A36m0u0&m=UHeTRaj2fJOS8eofLbCuddNDYr5YBFfte5x52g8cOh0&s=whK0QtntH0C5Yob4nwEPjwFCu8n7NZirV09FpwE_pbg&e=
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