I’ve enabled full hard drive encryption on all of my devices. The only exception
is my homeserver (mainly running Nextcloud), where all of my personal data is
stored. I’m the only user and have chosen a very strong root- and user password.
From what I’ve researched, the only person who can see my data physically is the
super user (aka. me), but if someone else doesn’t have the password, they can’t
read anything critical and my personal data are safe from the eyes of others.
Is that correct? If it is, why does LUKS exist?
(NEW!) Go through airport security with an encrypted laptop, sensitive information and free conference stickers showing your affiliations as an activist. Let airport security confiscate your laptop. Airport security drugs and wrenches you. You give them your laptop password. The police arrests you based on suspicions of terrorism.
Except when your drive is encrypted you can easily destroy its contents. Let’s say you’re DorkPirate1337 who happens to care about their opsec; you luksEncrypt your drive and have a simple script that runs when a specific USB key is disconnected, triggers luksErase, and then poweroffs. Voila, when the school principal snatches your unlocked laptop while you’re in the lib, all your pirated hentai becomes permanently unaccessible whether you give up the password or not. [Edit: the USB key is strapped to your wrist]
Note: luks uses 2 encryption keys, where one is randomly generated and encrypts the actual data, and the second one is given by the user and encrypts the first one; luksErase destroys the luks header containing that first key
Not that other means of accessing the passwords aren’t worth considering, but in the real world, it takes a lot more for someone to actually coerce your password from you than to use unencrypted storage.
I generally like xkcd, but this is a harmful trivialization of the value of encryption. In the real world, anything that isn’t encrypted is negligent as hell. There’s no valid reason not to do it, with maybe the exception of a thumb drive you’re sharing across a computers you don’t control and are clearly aware is not secure.
Lists of things not to do:
Except when your drive is encrypted you can easily destroy its contents. Let’s say you’re DorkPirate1337 who happens to care about their opsec; you
luksEncryptyour drive and have a simple script that runs when a specific USB key is disconnected, triggersluksErase, and thenpoweroffs. Voila, when the school principal snatches your unlocked laptop while you’re in the lib, all your pirated hentai becomes permanently unaccessible whether you give up the password or not. [Edit: the USB key is strapped to your wrist]Note: luks uses 2 encryption keys, where one is randomly generated and encrypts the actual data, and the second one is given by the user and encrypts the first one;
luksErasedestroys the luks header containing that first keyNot that other means of accessing the passwords aren’t worth considering, but in the real world, it takes a lot more for someone to actually coerce your password from you than to use unencrypted storage.
I generally like xkcd, but this is a harmful trivialization of the value of encryption. In the real world, anything that isn’t encrypted is negligent as hell. There’s no valid reason not to do it, with maybe the exception of a thumb drive you’re sharing across a computers you don’t control and are clearly aware is not secure.