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