Disabling LUKS encryption without backing up and restoring the whole partition

The problem: When installing Ubuntu, Debian or another flavour of Linux you chose to encrypt the hard disk, but now you want to get rid of the password prompt while booting. How do you do this without backing up, reformatting and restoring the entire partition?

The short answer first: There is no way to completely disable LUKS encryption - for that reason, many people in forums etc. recommend to back up the data, recreate partitions (or re-install the system) and then to restore the data.

However, it is possible to disable the password prompt while keeping the encryption in place. This effectively makes the encryption useless because we store the decryption password on the machine in clear text. Still, it is a much easier route than a full backup and restore. Furthermore, you can re-enable encryption easily again at a later time. The extra overhead of de/encrypting data on the drive is negligible these days.

The approach is as follows: Add a trivial password to the LUKS password slots, then instruct the boot process to create the password by printing it from a script during boot.

This is made slightly more complex by the fact that the script with the password must be added to the initramfs, the regular filesystem is not enough. Furthermore, what I only found out after many tries and a lot of headscratching is that empty pass phrases are not allowed in LUKS. This means that specifying /dev/null as the password file (or using /bin/true as the script) does not work. Finally, the setup "helpfully" disallows reading the passphrase from a file directly, we need to write a short script to output it.

Step-by-step instructions:

  • Add a new trivial passphrase to the passwords that will unlock your partition(s). My suggestion is the old classic, "password". Using a more obscure password will not give you extra security:
    cryptsetup luksAddKey /dev/sda2
    The sda2 may be different on your system - look at /etc/crypttab to find the correct value for your machine. (If LVM is used, /etc/crypttab may list "sda2_crypt" or similar instead of just "sda2".)
  • Ensure that a file containing the passphrase will be available at boot time, by hooking into the initramfs generation. Put into /etc/initramfs-tools/hooks/local-noluksprompt the following lines:
    mkdir -p ${DESTDIR}/root/bin
    cat >${DESTDIR}/root/bin/luks-password <<END
    #!/bin/sh --
    echo -n password
    END
    chmod +x ${DESTDIR}/root/bin/luks-password
    echo "Added cleartext password -- http://atterer.org/linux-remove-disable-luks-encryption-password-on-disk-partition-crypttab-initrd"
  • Make the file executable with
    chmod +x /etc/initramfs-tools/hooks/local-noluksprompt
  • Specify in /etc/crypttab that LUKS should get the passphrase during boot by executing the "luks-password" script. Do this by changing the last word luks into luks,keyscript=/root/bin/luks-password, so the line in crypttab will look similar to the following:
    sda2_crypt UUID=123456789 none luks,keyscript=/root/bin/luks-password
    Note: More recent versions of update-initramfs seem to be clever enough to make a copy of the script in the initramfs's /lib/cryptsetup/scripts/luks-password, so the extra hook script may not be required.
  • Finally, ensure that the initramfs filesystem of your currently running kernel is regenerated - if everything works, the "Added cleartext password" line should be output during the following command:
    update-initramfs -u -k`uname -r`
    I recommend against using the -kall option to update all initramfs-es - that way, if something goes wrong with this procedure you can still unlock the HD by booting an older kernel.

That's all! Should you want to disable this setup at a later point and go back to your previously set password, which still exists in one of the other LUKS password slots, just remove the trivial "password" entry:
cryptsetup luksRemoveKey /dev/sda2

Oh, and make it executable.

Oh, and make it executable.

and use #! at the beginning

and use #! at the beginning of the script.
Thanks to the original post and this comment, it worked perfectly for Ubuntu 14.04 LTS.

Thanks works great!

Thanks works great!

Download Davido and wizkid latest music

Nigeria Music Download

Download Mp3

Olamide Songs download

Westlife songs

Post Malone Album

Download Henry Danger

Comedy Movies

App Review

Larry June Out The Truck album zip

lil gotit album zip

Jackboy Lost in my head album zip

The Lion King Full Movie Download

Avenger Endgame Full Movie Mp4 Download

Spider Man Far From Home 2019 Full Movie

Shanghai Fortress 2019 Full Movie Mp4 Download

Best Free Chatbot

what is Ethereum

Download Westlife Songs

Download Drake Songs

Web Design Company

bhbujjwalsaini

Thanks you sharing information.
You can also visit on

Poetry By UJJWAL SAINI

How to think positive

Cure For Cowardice

Mudras

SOCIAL ANXIETY AND LOW SELF-ESTEEM

PUBLIC MEETING AND PRESENTATION

HOME WORKOUT PLAN

SkyNaijaMusic Design

Nice content..

Agarwal Packers Complaint - GIleShikwe

If you like a service or product, post your review here with others. Because your review help people make the right decision.

Good

Wow, nice blog , I love this blog seriously, and you can follow us @ Fulloaded

And also Download Latest Naija Music

Even you can visit our Naija Freebeat

music

https://www.weedmp3.com/

https://www.weedmp3.com/category/download-latest-music-mp3/

https://www.weedmp3.com/category/download-latest-music-mp3/nigeria/

https://www.weedmp3.com/category/download-latest-music-mp3/foreign/

https://www.weedmp3.com/category/download-latest-music-mp3/albums/

https://www.weedmp3.com/dmca/

https://www.weedmp3.com/contact/

https://geomp3.com

musics

free music download
download free music
free mp3 download
mp3 songs download
mp3 music download
how to download music from youtube
how to download free music
how to download music on iphone
how to download music from soundcloud
how to add music to iphone