Tor (aka The Onion Router) is a free software implementation of second-generation Onion Routing — a system enabling users to communicate anonymously on the Internet. Originally sponsored by the US Naval Research Laboratory, Tor became an Electronic Frontier Foundation (EFF) project in late 2004. The EFF supported Tor financially until November 2005, and continues to provide web hosting for the project. Contents
Tor aims to protect its users against traffic analysis attacks. Tor operates an overlay network of onion routers that enables two things: anonymous outgoing connections and anonymous hidden services.