Re: In answer to his question
Just Enough,
" .. I have information in my head. It is, to all intents and purposes, encrypted because only I have the key and access. ..."
You are forgetting the oft quoted https://www.xkcd.com/538/
Decryption of 'Your Information' is easier because there *is* a method that can access a built-in 'Backdoor' !!!
This sort of demonstrates the problem with all forms of Backdoors !!!
;) :)