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Change Ubuntu Passphrase
------------------------

About
=====

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


Links
=====

* `arch wiki: Encrypted Devices Using LUKS <https://wiki.archlinux.org/index.php/Dm-crypt_with_LUKS>`_
* `LUKS - Linux Unified Key Setup <http://code.google.com/p/cryptsetup/>`_


errors / ideas / contact
========================

* This page is not available for public editing.
* If you find an error, or want to make any contribution to this page, please contact us.



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