encrypt an external USB drive
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Arch Linux : encrypt an external USB drive

Howto encrypt an external USB drive


USB drive for backups. 
connected usb drive is sdb with one partition sdb1.
  1. create and open luks partition

     cryptsetup -c aes-xts-plain64 -y -s 512 luksFormat /dev/sdb1
     cryptsetup luksOpen /dev/sdb1 backup_drive
  2. create filesystem on decrypted partition

     mkfs.ext4	/dev/mapper/backup_drive

    close the luks container:

     cryptsetup luksClose /dev/mapper/backup_drive
  3. Using the encrypted drive 3.1 Mount

    cryptsetup luksOpen /dev/sdb1 backup_drive mount /dev/mapper/backup_drive /mnt

3.1 Umount

umount /mnt
cryptsetup luksClose /dev/mapper/backup_drive