Thanks to decades of being conditioned by TV shows and movies like those in the Mission: Impossible and James Bond franchises, we often assume that real spy organizations like Britain's MI6, Russia's GRU or our own CIA use only the most advanced technology in their efforts to clandestinely collect, alalyze and disseminate intelligence.
Organizations like these do, in fact, utilize cutting edge computer programs, robots, drones, lasers and satellites, as well as more esoteric devices like microwave-emitting "death rays" and acoustic weapons that fire "sound bullets," but it appears that they're also still using a form of technology that had its heydey back when the first passenger jets were just taking flight and Doo-wop was all the rage. Broadcasting into the airwaves from places unknown are long, sometimes continual, strings of numbers, letters, words and tones that anyone with a shortwave radio can intercept, but which only the spies who hold the code keys for deciphering the messages can comprehend. "what's the frequency, Kenneth?" >>