Change Ubunut Passphrase
This is a short howto on changing the harddrive passphrase on your ubuntu system.
It was successfully tested on
- Ubuntu Gutsy
Where is your encrypted partition?
- Have a look into /dev/mapper/. There should be an entry called ..._crypt, usually its sda5_crypt.
- Whenever I use "sda5" later on, replace it by whatever ..._crypt says in your setup.
Changing the passphrase
- You can't change the passphrase directly, add another passphrase and remove the old one.
- Passphrases are stored in "slots". So your first password is in "slot 0", the second will be in "slot 1" and so on.
- Be sure never to delete your last passphrase, or your data will be inaccessible forever.
Adding an additional passphrase
- Open a terminal, and type:
cryptsetup luksAddKey /dev/sda5
- enter the current passphrase
- enter the new/additional passphrase
Removing a passphrase
Warning: Do NOT delete the last available passphrase, or your data will be lost forever!
To delete the first passphrase (BE SURE THERE IS A SECOND ONE! TEST THE SECOND PASSPHRASE BEFORE DELETING THE FIRST!): cryptsetup luksDelKey /dev/sda5 0
- To delete the passphrase in the second slot (BE SURE THERE IS STILL ANOTHER PASSPHRASE PRESENT!):
cryptsetup luksDelKey /dev/sda5 1
errors / ideas / contact
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