With the grand ambition of sending unbreakable coded messages, some physicists are using exotic tools----to shut out (i)_____. But a wire and a few resistors may (ii)_____ a message as securely, according to a physicist who claim to have devised a simple and uncracked scheme. The idea shows that more (iii)_____ methods might compete with budding quanturn cryptography.
答案：C,D,G