Does it help to send qubits (whether locked or unlocked) through the Russian mail system? Can qubits eliminate the need for telephone calls? At 11:59 AM 5/9/2016, Fred Lunnon wrote:

But the penny has just dropped about Diffie-Hellman and "man-in-the-middle" --- Alice and Bob must acknowledge receipt by telephone, otherwise the post office might impersonate each to the other and nab the goodies after all!