It's already possible for two end points to securely decide on a cryptographic key in a way that's impervious to eavesdropping: https://en.wikipedia.org/wiki/Di

It's already possible for two end points to securely decide on a cryptographic key in a way that's impervious to eavesdropping: https://en.wikipedia.org/wiki/Diffie-Hellman_key_exchange https://en.wikipedia.org/wiki/Diffie-Hellman_key_exchange