Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

Having installed Ubuntu 11.10 with whole disk encryption and LVM, I need to provide a way for users to easily change LUKS passphrase.

Preferably, this should be done using GUI tools, thus, enabling novice users to perform this basic task.

share|improve this question
add comment

3 Answers 3

I am not familiar with gui tool but cryptsetup is the tool to interact with luks.

Basically AFAIK luks lets you add 8 passphrase slots and you can do that with:

sudo cryptsetup -y luksAddKey ENCRYPTED_PARTITION
sudo cryptsetup luksRemoveKey ENCRYPTED_PARTITION

where 0 is the slot number. I guess 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. Also I recommend you to visit other distro IRC channel just to be extra safe before you proceed.

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

cryptsetup

EDIT: Seems like gnome-disk-utility lets you change the passphrase.

enter image description here

enter image description here

share|improve this answer
    
cryptsetup luksRemoveKey <partition> actually takes a keyfile as the last parameter. So if you want to input the passphrase, just give the device as parameter. cryptsetup will first prompt for "Enter LUKS passphrase to be deleted:" and then "Enter any remaining LUKS passphrase:" –  user1338062 Apr 17 '13 at 9:30
add comment
cryptsetup luksChangeKey <target device> -S <target key slot number>

This will ask you first for a valid pass-phrase (in any enabled keyslot) then will prompt you fro the new passphrase in the target keyslot

I'm sure this can be wrapped up in an applet got windows oriented lovers.

share|improve this answer
add comment

Tested in ubuntu 14.04: Search for the "Disks" application

Select Device, select volume, Click cogs (more actions) -> "Change passphrase"

screenshot: http://imgur.com/wkgKjOa

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.