Questions about permissions and keys in linux

Question

linux

Actually 2 questions:
1. Is it possible for a user to somehow regain access rights if he has removed all access rights to his home directory?
2. How to undo all keys?

Answer 1

1. If he still owns it, then a normal chmod, for example, chmod -R +rw ~
2. What keys are we talking about?

Answer 2

1. Answer comrade merlin-vrn + under the root, you can bring everything to mind.
2. There is a recipe: remove all keys that interfere with life . Some programs have the rule "of two mutually exclusive, the last one works", others - "do nothing, say hello to the user about the keys."