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+
+
+
+Tor: 
+%size 8
+Next-generation Onion Routing
+
+
+%size 7
+Roger Dingledine
+Nick Mathewson
+Paul Syverson
+
+%%The Free Haven Project
+%%%font "typewriter", fore "blue"
+%%http://freehaven.net/
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+
+Low-latency anonymity system
+
+%leftfill
+Deployed: 19 nodes, hundreds of users (?)
+
+Many improvements on earlier design
+
+Free software -- available source code
+
+Design is not covered by earlier onion routing
+patent
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+
+Perfect forward secrecy
+
+
+Telescoping circuit
+
+	negotiates keys at each hop
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%page
+%%
+%%Separation from "protocol cleaning"
+%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+
+No mixing, padding, traffic shaping (yet)
+
+
+Please show us they're worth the usability tradeoff
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%page
+%%
+%%Many TCP streams can share one circuit
+%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+
+Congestion control
+
+
+Simple rate limiting
+
+Plus have to keep internal nodes from overflowing
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+
+Directory servers
+
+
+Approve new servers
+
+Tell clients who's up right now
+
+	plus their keys, location, etc
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+
+Variable exit policies
+
+
+Each server allows different outgoing connections
+
+E.g. no servers allow outgoing mail currently
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+
+End-to-end integrity checking
+
+
+In previous onion routing, an insider could change
+the text being transmitted:
+
+"dir" => "rm *"
+
+Even an external adversary could do this!
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+
+Rendezvous points
+
+
+allow hidden services
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+
+Differences / limitations
+
+
+We're TCP-only, not all IP (but we're user-space and very portable)
+
+Not peer-to-peer
+
+No protocol normalization
+
+%%Not unobservable
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+
+We have working code
+
+
+Plus a design document,
+and a byte-level specification
+
+%size 9
+http://freehaven.net/tor/
+