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A very simple form of traffic analysis might involve sitting somewhere between sender and recipient on the network, looking at headers.But there are also more powerful kinds of traffic analysis.Tor helps to reduce the risks of both simple and sophisticated traffic analysis by distributing your transactions over several places on the Internet, so no single point can link you to your destination.The idea is similar to using a twisty, hard-to-follow route in order to throw off somebody who is tailing you — and then periodically erasing your footprints.They also use it to replace traditional VPNs, which reveal the exact amount and timing of communication. Which locations have employees consulting job-hunting websites? Navy uses Tor for open source intelligence gathering, and one of its teams used Tor while deployed in the Middle East recently.Which research divisions are communicating with the company's patent lawyers? Law enforcement uses Tor for visiting or surveilling web sites without leaving government IP addresses in their web logs, and for security during sting operations.The client negotiates a separate set of encryption keys for each hop along the circuit to ensure that each hop can't trace these connections as they pass through.
To create a private network pathway with Tor, the user's software or client incrementally builds a circuit of encrypted connections through relays on the network.
Individuals also use Tor for socially sensitive communication: chat rooms and web forums for rape and abuse survivors, or people with illnesses.
Journalists use Tor to communicate more safely with whistleblowers and dissidents.
The circuit is extended one hop at a time, and each relay along the way knows only which relay gave it data and which relay it is giving data to.
No individual relay ever knows the complete path that a data packet has taken.