Tor (anonymity network) - Wikipedia, the free encyclopedia

Tor directs Internet traffic through a free, worldwide, volunteer network consisting of more than five thousand relays to conceal a user's location and usage from anyone conducting network surveillance or traffic analysis. Using Tor makes it more difficult for Internet activity to be traced back to the user: this includes "visits to Web sites, online posts, instant messages, and other communication forms".


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http://www.scoop.it/t/securite-pc-et-internet/?tag=TOR