A service called Tor makes it possible to communicate and surf the web anonymously. It sounds like a plot by privacy-minded rebels, but in fact the service receives most of its funding from the government and was started by the U.S. Naval Research Laboratory. Despite recent revelations of government email snooping, the U.S. government supports anonymous communication so foreign dissidents can work undetected, and so government agents can pursue bad guys without giving away their identities. But now the service faces new accusations that it might be serving NSA surveillance efforts.