I created test LUKs container in a file, the luksDump says

MK bits: 256
Payload offset: 4096

implying that the header is 4096*512 = 2MiB
but the file produced by

cryptsetup luksHeaderBackup --header-backup-file header.backup /dev/loop0

is only 1052672 (1MiB + 4096)

Why ?


The payload start is rounded up for alignment purposes. How much can be controlled by providing the --align-payload option to luksFormat.

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