====== Chiffrer son disque dur ======
  - cryptsetup luksFormat /dev/sdx1
  - cryptsetup luksOpen /dev/sdx1 sdx1
  - dd if=/dev/zero of=/dev/mapper/sdx1
  - cryptsetup luksClose sdx1
  - dd if=/dev/urandom of=/dev/sdx1 bs=1M count=1 conv=notrunc