Have you ever felt that you are being watched in whatever you do online? Websites seem to know who you are and can greet you with your name when you visit them. Google always seems to know what you are searching, even before you started the search. Getting scared? Perhaps it’s time to turn your privacy filter on. Tor is free software and an open network that helps you defend against a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security known as traffic analysis.