passphrase/keyring management: 14.04 whole disk encryption

Question

With 14.04 whole disk encryption can one add multiple passphrases and/or revoke them ?

Answer 1

LUKS:

Basically as far as I know LUKS lets you modify 8 passphrase slots and you can do that with:

sudo cryptsetup luksAddKey <device>
sudo cryptsetup luksRemoveKey <device>
sudo cryptsetup luksChangeKey <device> 
sudo cryptsetup luksKillSlot <device> <key slot number>

LUKS stores slots as 0,1,2 etc. But I recommend you to be very careful with LUKS as you may lock yourself out. Please refer to manual of cryptsetup.

You may need to reboot the machine and try your new passsphrase as well before you remove the key.

CryptSetup

Gnome-disk-utility also lets you change the passphrases.

Source

Answer 2

EncryptedFilesystemHowto5

That link provide everything about encryption.He asked about different (add multiple passphrase)