Spy Vs.Spy

摘要

Tor, an acronym for "the onion router," is software that provides the closest thing to anonymity on the Internet. Engineered by the Tor Project, a nonprofit group, and offered free of charge, Tor has been adopted by both agitators for liberty and criminals. It sends chat messages, Google searches, purchase orders, or e-mails on a winding path through multiple computers, concealing activities as the layers of an onion cover its core, encrypting the source at each step to hide where one is and where one wants to go. Some 5,000 computers around the world, volunteered by their owners, serve as potential hop points in the path, obscuring requests for a new page or chat. Tor Project calls these points relays. Its users are global, from Iranian activists who eluded government censors to transmit images and news during the 2009 protests following that year's presidential election, to Chinese citizens who regularly use it to get around the country's Great Firewall and its blocks on everything from Facebook to the New York Times. In addition to facilitating anonymous communication online, Tor is an access point to the "dark Web," vast reaches of the Internet that are intentionally kept hidden and don't show up in Google or other search engines, often because they harbor the illicit, from child porn to stolen credit card information.