mirror of
https://gitlab.torproject.org/tpo/core/tor.git
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281 lines
6.2 KiB
Plaintext
281 lines
6.2 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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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%page
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Low-latency anonymity system
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%leftfill
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Deployed: 20 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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Talk Overview
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A bit about Onion Routing
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Improvements we've made
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Some related work
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Some lessons learned
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Ask me questions
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%page
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Anonymity: Who needs it?
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Private citizens
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advocacy, counseling, whistleblowing, reporting, ...
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%size 6
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Higher-level protocols
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voting, e-cash, auctions
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%size 6
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Government applications
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research, law enforcement
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%size 6
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Business applications
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hide relationships and volumes of communication
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Who is visiting job sites?
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Which groups are talking to patent lawyers?
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Who are your suppliers and customers?
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Is the CEO talking to a buyout partner?
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%page
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Anonymity is a network effect
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%page
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Onion Routing is...
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An overlay network
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Users build virtual circuits through the network
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One layer of encryption at each hop
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Fixed-size cells
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%page
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Tor's goal
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Conservative design (minimize new design work needed)
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Support testing of future research
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Design for deployment; deploy for use
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%page
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Threat model
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Protect against curious Bob
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Protect against somebody watching Alice
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Protect against a few curious nodes in the middle
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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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Perfect forward secrecy
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Telescoping circuit
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negotiates keys at each hop
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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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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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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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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Related work
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c/n vs c^2/n^2 vs 2
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freedom, peekabooty, jap
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%page
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Future work
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Threshold directory agreement
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Restricted-route (non-clique) topology
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Morphmix/p2p extensions?
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Location-hidden servers via rendezvous points
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Make it work better
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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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%size 6
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Privacy Enhancing Technologies workshop
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%size 9
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http://petworkshop.org/
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