I'm also totally uninformed, but my gut feeling is that physical systems don't encrypt information, at least not in the way we assume when talking about encrypt

I'm also totally uninformed, but my gut feeling is that physical systems don't encrypt information, at least not in the way we assume when talking about encryption. Also if you go down that route you risk having something that can't be proven: how do you prove that black holes are not using a one time pad to encrypt information, with each black hole using a different and random key?