In an absolute sense, a golden key is already possible, and we have the cryptography necessary to do it. In a practical sense, a security system that has a gold

In an absolute sense, a golden key is already possible, and we have the cryptography necessary to do it. In a practical sense, a security system that has a golden key is necessarily more complicated than one without it, and have yet to demonstrate an ability to reliably construct a secure system even without a golden key. On another practical sense, we would need to construct an entire key management infrastructure so that it is possible for government agents with legitimate access to use the golden key, and this infrastructure itself would be a high value target.