How to compress LUKS v2 header?

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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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