19.2. Using volume_key as an individual user

As an individual user, volume_key can be used to save encryption keys by using the following procedure.

Note

For all examples in this file, /path/to/volume is a LUKS device, not the plaintext device contained within. blkid -s type /path/to/volume should report type="crypto_LUKS".

Procedure 19.1. Using volume_key stand-alone

  1. Run:
    volume_key --save /path/to/volume -o escrow-packet
    A prompt will then appear requiring an escrow packet passphrase to protect the key.
  2. Save the generated escrow-packet file, ensuring that the passphrase is not forgotten.
If the volume passphrase is forgotten, use the saved escrow packet to restore access to the data.

Procedure 19.2. Restore access to data with escrow packet

  1. Boot the system in an environment where volume_key can be run and the escrow packet is available (a rescue mode, for example).
  2. Run:
    volume_key --restore /path/to/volume escrow-packet
    A prompt will appear for the escrow packet passphrase that was used when creating the escrow packet, and for the new passphrase for the volume.
  3. Mount the volume using the chosen passphrase.
To free up the passphrase slot in the LUKS header of the encrypted volume, remove the old, forgotten passphrase by using the command cryptsetup luksKillSlot.