http://www.nytimes.com/2014/01/15/u...n-computers-not-connected-to-internet.html?hp
The technology, which the agency has used since at least 2008, relies on a covert channel of radio waves that can be transmitted from tiny circuit boards and USB cards inserted surreptitiously into the computers. In some cases, they are sent to a briefcase-size relay station that intelligence agencies can set up miles away from the target.
you need to see the graphic to understand .....