This tutorial is about installing a full-disk-encrypted 64-bit Arch Linux ARM system (ARMv8) on the Raspberry Pi 3B+ .
Since the tutorials one can find on the net are all outdated, as a lot has changed in the years, i made an up-to-date one.
The AchlinuxARM-rpi-3-latest.tar.gz image is used.
Dropbear is included in the initramfs, so you can unlock your encrypted root partition over SSH at boot.
Enjoy!
Arch Linux ARM 64 on Raspberry Pi 3 B+ With Full Disk Encryption And SSH Unlock: 2018 Edition