My laptop isn’t under my supervision most of the time. And I’d hate it if someone were to steal my SSD, or whole laptop even, when I’m not around. Is there a way to encrypt everything, but still keep the device in sleep, and unclock it without much delay. It’s a very slow laptop. So decryption on login isn’t viable, takes too long. While booting up also takes forever, so it needs to be in a “safe” state when simply logged out. Maybe a way that’s decrypt-on-demand?
I’m on Arch with KDE.
The standard route is to decrypt on boot. It happens after GRUB but before your display manager starts. IDK if there even is a setup that has you “decrypt on login”. Thats sounds like your display manager (sddm for KDE) is decrypting system which is not possible IMO.
Unless your laptop somehow has multiple drives you’ll want to use the “LVM on LUKS” configuration. 1 small partition for /boot. The rest gets LUKS encrypted, and an LVM group is put on the LUKS container. Or you could replace LVM with btrfs.
This will require wiping your system and reinstalling so you have some reading to do.
- https://wiki.archlinux.org/title/Dm-crypt (aka LUKS)
- https://wiki.archlinux.org/title/Dm-crypt/System_configuration
- https://wiki.archlinux.org/title/Dm-crypt/Encrypting_an_entire_system
- https://wiki.archlinux.org/title/Dm-crypt/Encrypting_an_entire_system#LVM_on_LUKS
The arch-install script in the live iso has options for full disk encryption.
If you suspend to RAM your system will stay unencrypted, because your ram is not encrypted. if you suspend to disk (aka hibernate) your system will be encrypted. You go through the boot loader when waking from hibernation but it just drops you off where you left off.
You need a swapfile for hibernation so make sure its inside the LUKS container.
There is a way for just your home folder to be encrypted, Linux Mint has it as an option.
To add to the comments, most distros do not offer FDE by default when installing. You have to jump thru hoops. No idea why this is still the case given how many consumer computers are laptops these days, it seems crazy.
The big exception seems to be PopOS, an Ubuntu derivative which is intended for laptops. FDE by default so it must be pretty easy to get that up and running.
Ubuntu itself has a solid FDE option on install, too. It sets up the LVM configuration as already described, no expertise needed. And IME works very reliably.
openSUSE also has a simple FDE setup. Just check a box and enter a passphrase during install. It’s not default, but it’s about as easy as possible to set up.
Useful to know, thanks.
For the record, I once had a bad experience with the Debian installer’s version. That is why I will not be trying Debian again. Installation is a moment of vulnerability, when you don’t have ready access to your data, or the network, and this is one extra factor. IMO it really is non-negotiable for a distro to provide a bulletproof installation experience.
I’m pretty sure all the major distros have FDE as an option in the installer its just never on by default. Fedora does the same but with BTRFS on LUKS. I’m sure Debian does. Someone else says OpenSuse does. Maybe some derivative distros don’t but I suspect the ones with an graphical installer do.
its just never on by default
Except PopOS, as I understand it. IMO that is a major point in its favor and against its competitors, given the dominance of laptops today. I see no reason why this is still opt-in, rather than opt-out as on mobile OSs.
Keep in mind an unencrypted /boot partition still leaves you open to an evil maid attack. I’m not really paranoid (or interesting) enough that I feel the need to take measures to prevent those kinds of attacks, but your situation may differ.
Dreams of Code on YouTube has a video for a full start to finish arch install specifically including full disk encryption. While my computer is far from “slow” it’s also nothing crazy, and other than adding a second password to my bootup process, the decrypting really doesn’t take long.
How old are we talking? If the CPU is >10 years old and/or some kind of ARM, it may not have hardware encryption acceleration, which means it’ll happen in software. I did that once, it was horrible. lscpu |grep -i aes should probably tell you what you need to know.
It does give me a result so I do have “aes”. How can I use it?
We’re talking an Intel i5-8350U. it has 16GBs of ram and 500GB of SSD.
You said you’re on Arch, you’ll want to go through their docs which are solid: https://wiki.archlinux.org/title/Dm-crypt/Encrypting_an_entire_system
That’s not a slow laptop. I’ve been daily driving worse for years.
To protect the data from random thief just browsing through the files I still use ecryptfs. It only encrypts the home directory, and the keys are derived from my accounts password, so no extra hassle.
The encryption is weak by the current standards, and wouldn’t stop a determined attacker, but it’s 100% better than nothing, and I’ve never noticed any performance problems.
That’s pretty much my ThinkPad’s Specs. Fine for almost all stuff I have to do on the go (expect CAD, don’t try to run BricsCAD on the thing, it’ll make you go crazy.)
I use full disk encryption on it, as on all my other devices, and it’s fine, speed-wise. The SSD is NVME, not SATA, but I doubt the performance impact would be noticeable on a SATA SSD if that’s what you’ve got.
mine’s m.2 too. I tried systemd-homed, as of now it doesn’t work as it should. Next I’ll try disk/partition one but it’d be great to encrypt when sleeping, it’s fine if it’s hibernation
That is absolutely not a slow laptop. If it takes a long time to boot there must be something wrong. I have a similar system that takes about ten seconds to boot.
Anyways, like others said, LVM with LUKS is the simplest. It uses your hardware to quickly decrypt the drive on boot. While it is running access to your data is protected by your login manager or lock screen.
That’s a hard thing to do for a bunch of reasons. There’s someone else who went into em so I’m not gonna do that.
Unless something’s seriously wrong, it would probably be better to just make your laptop boot faster.
So, what’s your laptop, what kind of disk does it have and how long does it take to boot/login?
Is your idea to do the easier decrypt on boot, and optimize the boot times?
I could probably do that, but someone else said that there is a decrypt on hibernate, seems better.
Yeah im thinking do “normal” decrypt on boot. It’ll be easier to troubleshoot and recover from if something goes wrong and there’s fewer pitfalls to deal with.
I also suspect that theres a problem with your computer because boot times have been pretty fast for many years now.
E: I just now saw that you’re using an eighth generation intel processor, plenty of ram and an ssd.
I have the same situation but a much older processor and my boot times from button press to desktop are ~10 seconds.
Unless your expectations for boot times are way out of line, you ought to have no problem using decrypt on boot.
One possibility is that your ssd has aged and is having to read those old system file blocks hundreds of times to get it right. Badblocks -n or spinrite level 2 or 3 scan fixes this problem.
I bought it used, so I’m interested in your last point. I’ve reinstalled it - first thing I did. Do SSDs slow down overtime? And there is a linux command to fix that? Sound crazy, can you elaborate?
LUKS2 with a strong hash.
It will take a while to decrypt but it will so be worth it. You only have to enter the password once.
LUKS2
