once again... i'll be pushing for my work distro, just because i think it's an under-appreciated distro that can easily stand up to other (more popular) ones... i'm not affiliated with suse, but by working with them for many years, i grew to love how this distro works...
I usually don't use gui tools, but when i hear the words "encryption", "just works" and "easy" floating around, i automatically think about yast2 (also available as an ncurses based tool from the gui).
on a test vm, i added a new virtual disk... here you see the lsblk output (sdc = the new device)
This is SLES (suse linux enterprise server) because i didn't have a recent opensuse image to deploy on the test vm... But opensuse also uses yast2, so the screens should be comparable
i started the partitioner of yast2, here's sdc (unpartitioned). I just had to click the "add partition" button at the bottom of the screen
the add partition wizard was started
some more questions
here, i'm asked if i have to format the device, the partition id, wether or not an entry should be make in the /etc/fstab... And a simple checkbox to indicate the device should be encrypted
if selected, you need to enter a password
some next/next/next/finish/ok buttons follow (not screencapped)
and we end up here (lsblk output)
offcourse, when booting, you need a terminal to enter the passphrase...
I would also like to dedicate a couple of minutes talking about safety. Thinking linux is always more secure than (for example) windows isn't completely correct... A recent, popular, stable, out of the box, linux distro is allmost always more secure than a recent, plain-vanilla windows installation... But not completely secure. And if you do a bad job configuring and maintaining your linux partition it can be less secure than a well configured and maintained windows installation.
Suse is knows as a secure distro, you would not believe how many flags pop up if you run the stig profile trough openscap on a plain vanilla installation... It took me ages to close most of the "gaps", but it's allmost impossible to get a perfect score. Next to this, security vulnerability's are found (and patched) on a daily basis, there ARE virusses targetting linux distro's... And then there's the PICNIC problem, every piece of software has config you CAN (and probably will) mess up, sometimes resulting in a (small) attack vector.
Once again, i'm a big linux fan... I come from managing actual unix systems and rolled into linux many (many) years ago... And i can say that a properly setup, patched, mainted, monitorred,... linux distro can be *very* secure. I can honestly say that i'm convinced my linux servers are more secure than the windows servers in my company... Linux is great for beginners all the way to veterans, but thinking it's 100% safe is not a good idear.