Ok, so I've been debugging the last update of my system and found this warning running
journalctl -b -p warning:
systemd-cryptsetup: Key file <location> is world-readable. This is not a good idea!
Generally I understand what is the matter and that it's bad. Though I don't know how to fix this properly without ruining my boot.
Then comes the question: what permissions do I have to set for that file to make my system working correctly while removing the warning? Is
600 ok? Or do some system groups also need an access to this file?