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The CryFS developers have a comparison page here that might help you decide what to use. There's a summary table at the bottom that gives a comparison of features between encryption filesystems if you don't feel like reading through it all.
I personally use and would recommend CryFS because it's the only one (that I'm aware of) that plays nice with data synchronization software (i.e. doesn't store the container as a single file) while keeping the directory structure encrypted.
I don't see Cryptomator in the comparison. Doesn't it have a similar feature set?
Was not aware of this, thanks! Looks like it does, with a notable difference being that Cryptomator has better cross-platform support in exchange for not having file size obfuscation.
Yeah, Cryptomator does sound like a good option. But I personally found the comment from the developer at the bottom to be a bit off-putting. I don't like when people needlessly trash-talk other options.
If you value privacy higher than availability and integrity, this certainly is a point for CryFS. With Cryptomator, we strive for the best of all three primary security targets [...] [...] I personally dislike snakeoil statements on their website like “the security of CryFS has been proven”. While I don’t see a problem with the cryptography, I prefer to keep some distance from phrases used by all those “military grade security” bogus companies.
He seems to belittle the importance of a key advantage of CryFS, and then goes on to accuse them of being 'snakeoil statements' because CryFS said their security was 'proven' in a masters thesis. I'm sure that 'proven' is not a great choice of word here, but I don't think CryFS was trying to trick anyone. They're just saying that the tool has been thoroughly analysed in a masters thesis and found to be secure.
One of the 'advantages' being touted for Cryptomator is that it is more 'stable' than CryFS. But the claim of stability coimes from CryFS saying their software is in beta while Cryptomator says theirs is complete. The way I see it, that's not really a measure of stability; it's a measure of caution from the developers. Stability and reliability are not things you can just claim, or base on whether or not something is called 'beta'. It's about testing, and analysing. So, in that context of CryFS expressing caution, to say their masters thesis statement is a 'snake oil statement', I think is disingenuous.
(Note: I've given an in-depth explanation of something that really isn't a big deal. What the developer said is not that bad. I just wanted to articulate why I found it off putting.)
Seems like a pretty minor complaint all in all. It's a free open source project that solves a real world issue well.
Is not like he even bashed the project that much, just pointed out a few of his own pet peeves.
IMO it has a better feature set because it has a native android app with remote storage support built in, and native desktop apps with a GUI.
I guess it's mostly because it way written by CryFS people - but that does make CryFS sound pretty good; with the main downside being that it is less mature than some other tools. And it gives useful info on the others regardless.
What about ?
It's very easy to use and cross-platform. You can create a volume of arbitrary size, either as a file or using a device/partition, then mount it when you need it.
I use gocryptfs because it can be used on Android (DroidFs) and Linux desktop so I can sync my shares.
There's a few GUIs for desktop for it that you can try out and see if they help with your use case.
I appreciate all the comments and links, everyone. Thanks a heap. I feel like I've got a much stronger and up-to-date understanding of what's available now.
While checking out various links, I've found this detailed comparison provided by GoCrypt. It includes comparisons of features, encryption methods, and a couple of performance metrics. So that's valuable information for decision making. I found the CryFS comparison page useful too, but that felt more about highlighting the advantages of their tool rather than a thorougher comparison of different tools.
https://wiki.archlinux.org/title/ECryptfs
ECryptfs is the most common solution.
Edit: LUKE can also used:
https://wiki.archlinux.org/title/Dm-crypt/Device_encryption
Yes, until you've to build it from the source because... https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=928956
Unfortunately ECryptfs seems to be only one that supports inotify as the other popular solutions (gocryptfs, encfs, cryfs) are all FUSE based and it doesn't seem to play very well with inotify. And cryptomator is another FUSE joke that will lead to data loss.
I had forgotten about LUKE, have you tried it?
I need something that is able to encrypt single files - not an entire disk / partition / volume or a disk image. I'm using Syncthing on those encrypted files so having them as a partition or single file doesn't work out.
On a folder level that is how I work both in Linux and windows.
For single use encryption the is also GPG.
https://devconnected.com/how-to-encrypt-file-on-linux/
Edit2:
With Syncthing there is options to use a / partition / volume or a disk image.
I am assuming you are using a linux desktop.
You can use tools like LUKE with Systemd-homed, where the home folder is encrypted, that get mount at login, and Syncthing service get started after mount.
Unless I'm missing something, what I need is something that I can point to a folder and say "this is encrypted" and it will mount an unencrypted version of that somewhere. What ECryptfs does is that it encrypts any file I place on the foder individually / doesn't create a single block of data that is hard to sync. GPG is file by file manually.
I used to use encfs. While it was fine, it hasn't really gotten any dev work in several years, and I wouldn't recommend it as a first choice.
I had pretty good luck with tomb.
I'm not sure what you mean by 'good luck' here. Perhaps you got some really cool random encryption blocks or something? In any case, I hadn't heard of that one yet. So thanks for mentioning it.
Their approach with separate key-files is probably a wise idea for serious security... but I don't think I'm that serious right now.
The puns in the commands feel like they are a style from the past. I don't think people would do that in serious software made today. I guess this one has been around for awhile!
I mostly just meant that it was easy to use and never lost or ate any of my data.
I switched over to cryptomator because it lines up better with my use case, but I've heard rumors of it losing data, so I'm keeping a close eye on it for now.
What's your threat model?
Personally I think full disk encryption with LUKS is the only worthwhile setup. Directory-based encryption software tends to be error-prone, and is much more vulnerable.
One advantage of directory-based encryption is for online backups. I use SpiderOak to backup some stuff, and so I can tell it backup my encrypted data without it ever seeing the unencrypted data. I don't think that's so easy with full-disk encryption. (I suspect only a handful people in the world still use SpiderOak, but the idea applies to whatever cloud backup thing you might use.)
Similarly, it means I can lend a portable HDD to someone to share videos or something, but still have private stuff stored on there as well if I want to.
I personally use cryptomator https://cryptomator.org/
Because I can use it regardless of the underlying file system and OS, you can set up different vaults and you can store these vaults in the cloud if you want so you can access your shit on any device