Attacks against Tor are an active area of academic research,which is welcomed by the Tor Project itself. The NSA has a technique that targets outdated Firefox browsers codenamed EgotisticalGiraffe, and targets Tor users in general for close monitoring under its XKeyscore program. One way this may be achieved is by exploiting vulnerable software on the user's computer. Because the routing of the communication is partly concealed at every hop in the Tor circuit, this method eliminates any single point at which the communicating peers can be determined through network surveillance that relies upon knowing its source and destination.Īn adversary might try to de-anonymize the user by some means. The final relay decrypts the innermost layer of encryption and sends the original data to its destination without revealing, or even knowing, the source IP address. Each relay decrypts a layer of encryption to reveal only the next relay in the circuit in order to pass the remaining encrypted data on to it. Tor encrypts the data, including the destination IP address, multiple times and sends it through a virtual circuit comprising successive, randomly selected Tor relays.
Onion routing is implemented by encryption in the application layer of a communication protocol stack, nested like the layers of an onion. Tor's use is intended to protect the personal privacy of users, as well as their freedom and ability to conduct confidential communication by keeping their Internet activities from being monitored.
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". Tor directs Internet traffic through a free, worldwide, volunteer network consisting of more than six thousand relays to conceal a user's location and usage from anyone conducting network surveillance or traffic analysis.
The name is an acronym derived from the original software project name The Onion Router. Tor is free software for enabling anonymous communication.
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