Mapping erzeugen (Passwort erforderlich):

cryptsetup luksOpen /dev/xvdc backup2

Mapping mounten:

mount /dev/mapper/backup2 /backup2

Mapping überprüfen:

cryptsetup -v status backup2

luks-Header ausgeben:

cryptsetup luksDump /dev/xvdc

Mapping beenden:

cryptsetup luksClose backup2

Passwort ändern:

cryptsetup luksAddKey /dev/xvdc
cryptsetup luksRemoveKey /dev/xvdc

https://www.cyberciti.biz/security/howto-linux-hard-disk-encryption-with-luks-cryptsetup-command/