>> I have done this on other distributions like Void Linux, so I understand
>> the main idea is use cryptsetup to format a luks partition, use lvm to
>> create logical volumes on that partition, install like normal, then set
>> up the kernel and grub to see the encrypted drive and decrypt it. I
>> guess my main question then is how do I add this to the kernel in CRUX?
>> I did find it on the wiki https://crux.nu/Wiki/Cryptsetup, but it seems
>> to be really old. Has anyone done this recently and with EFI?
I have tried in the past to set this up following the crux wiki
cryptsetup page, I can't remember what part I couldn't get working
though I also didn't have too much time back then to mess around with
it. One thing that's always confused me in terms of initrd and initramfs
is what to pass to the bootloader, because every distro requires
different arguments to be passed. I think the simplest bootloader to
deal with in terms of LVM on LUKS would be LILO because it has an initrd
option (this should also apply to ELILO).

> I will explore this as well. I suspect that the main hurdle is going to
> be setting up an initramfs and setting up a method to update it for
> newly installed kernels.
For building an initramfs and also updating it for newly installed
kernels I recommend checking out:
https://wiki.gentoo.org/wiki/Custom_Initramfs. From what I know you can
make a directory which will house all the files for your initramfs and
then point to that directory in your kernel config, so that when you
make your kernel (considering you use the same config) your initramfs
will be built and/or embedded into your new kernel.