Then please prove the possibility by doing so. Up to now, there has only been intense wishful thinking by politicians, and strong "NOPE" by anyone with any kin

Then please prove the possibility by doing so. Up to now, there has only been intense wishful thinking by politicians, and strong "NOPE" by anyone with any kind of knowledge about cryptography. Either really everyone, including the likes of NSA, CIA and other spy services don't actually employ top cryptographers. Or they repeatedly tried and failed miserably. Or really nobody, including the spies, wants backdoored NOBUS encryption.