Putting The P Back In Vpn: An Overlay Network To Resist Traffic Analysis

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Presented at Blackhat USA 2004 by

Roger Dingledine

Tor (second-generation Onion Routing) is a distributed overlay network that anonymizes TCP-based applications like web browsing, secure shell, and instant messaging. We have a deployed network of 30 nodes in the US and Europe, and the code is released unencumbered as free software. Tor's rendezvous point design enables location-hidden services—users can run a standard webserver or other service without revealing its IP.