NSA Surveillance Computers

There are new reports on some of the National Security Agency's surveillance tactics.

FOX News Radio's Steve Knight reports:

The tactic sounds like something out of a spy movie: implant software on nearly 100,000 computers around the world--sometimes using a secret technology that lets the National Security Agency get into computers even if they're not connected to the Internet.

That's what the New York Times is reporting, based on NSA documents, computer experts and American officials.

The technology relies on a covert channel of radio waves that can be transmitted from tiny circuit boards and USB cards secretly slipped into computers.

The NSA call the tactics "active defense" against foreign cyber-attacks, not tactics to go on the offensive.

The Times reports there is no evidence that the tactics were used inside the United States.

Steve Knight, FOX News Radio.