Plugin that allows seamless file encryption via encpipe
Because Vim built-in encryption sucks. It is unsafe, uses obsolete algorithms, uses no authentication (so attacker can alter data even without knowing password), uses unsafe mode of operation. In general everything what is in the sentence "do not invent your own encryption" in one. That is why NeoVim removed it, because it is really bad.
Just do not use it, never.
This uses encpipe which is created by author of awesome libsodium, however it is based on much smaller and simpler libhydrogen.