security, Tutorials/Tips

How to manage disk encryption passphrases and key slots

Now, when you do a cryptsetup luksDump /dev/sdaX, you will see that you now have two key slots (key slot 0 and key slot 1) in ENABLED status.

luks_05
Two active key slots

With a backup passphrase in place, it is now save to delete the first key that you wanted to delete. And you delete a key, that is, disable a key slot, by typing cryptsetup luksKillSlot /dev/sdaX Y. In this command, “Y” is the key slot that you want to disable. In this particular case, the command will be cryptsetup luksKillSlot /dev/sda7 0 because we are attempting to delete the passphrase stored in the first key slot (key slot 0).

luks_06
Deleting a passphrase

If you do another cryptsetup luksDump /dev/sdaX, you will see that the first key slot, key slot 0, is in DISABLED status.

luks_07
Key dump

Now that you have just one active passphrase, you may want to create another one as a backup, and you can create one in any of the available key slots, including the one you just disabled.

Related Post:  17 alternatives to your default image viewer on Fedora

I hope the information presented here has given you some insight into disk encryption passphrase management. This is introductory information. There are more advanced key management tasks that I will address in a future post. Corrections and questions are welcome.

Related Post:  Just a few tricks to make you more efficient at the command line

LinuxBSDos needs your donation to continue!

I hope this article has saved you valuable time and effort to fix a problem that would have taken more time than is necessary. That makes me happy, and why I love doing this. But because more people than ever are reading articles like this with an adblocker, ad revenues have fallen to a level that's not enough to cover my operating costs. That's why I want to ask you a favor: To make a one-time or recurring donation to support this site and keep it going. It's a small favor, but every one counts. And you can make your donation using Patreon or directly via Paypal. Thank you for whatever donation you're able to make.

Donate via Patreon. Donate via Paypal.

Aside from donation, you may also signup to receive an email once I publish new content. Your email will not be shared or traded to anyone. And you can unsubscribe at any time.

Please share:

We Recommend These Vendors and Free Offers

Launch an SSD VPS in Europe, USA, Asia & Australia on Vultr's KVM-based Cloud platform starting at $5:00/month (15 GB SSD, 768 MB of RAM).

Deploy an SSD Cloud server in 55 seconds on DigitalOcean. Built for developers and starting at $5:00/month (20 GB SSD, 512 MB of RAM).

Want to become an expert ethical hacker and penetration tester? Request your free video training course of Online Penetration Testing and Ethical Hacking

Whether you're new to Linux or are a Linux guru, you can learn a lot more about the Linux kernel by requesting your free ebook of Linux Kernel In A Nutshell.


3 Comments

  1. Opensuse also supports disk encryption (and LVM) natively in its GUI install program.

  2. Pingback: Manage your disk encryption passphrases « 0ddn1x: tricks with *nix

  3. Pingback: Links 8/10/2010: Linux Tablet Price Goes Down Under $200, Fedora 14 Beta Preview | Techrights

Leave a Comment

Your email address will not be published. Required fields are marked *

*