doc/rump-fc04.mgp

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  33 %%
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %page
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  38
  39
  40
  41 Tor:
  42 %size 8
  43 Next-generation Onion Routing
  44
  45
  46 %size 7
  47 Roger Dingledine
  48 Nick Mathewson
  49 Paul Syverson
  50
  51 %%The Free Haven Project
  52 %%%font "typewriter", fore "blue"
  53 %%http://freehaven.net/
  54 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  55 %page
  56
  57 Low-latency anonymity system
  58
  59 %leftfill
  60 Deployed: 19 nodes, hundreds of users (?)
  61
  62 Many improvements on earlier design
  63
  64 Free software -- available source code
  65
  66 Design is not covered by earlier onion routing
  67 patent
  68
  69 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  70 %page
  71
  72 Perfect forward secrecy
  73
  74
  75 Telescoping circuit
  76
  77         negotiates keys at each hop
  78
  79 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  80 %%page
  81 %%
  82 %%Separation from "protocol cleaning"
  83 %%
  84 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  85 %page
  86
  87 No mixing, padding, traffic shaping (yet)
  88
  89
  90 Please show us they're worth the usability tradeoff
  91
  92 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  93 %%page
  94 %%
  95 %%Many TCP streams can share one circuit
  96 %%
  97 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  98 %page
  99
 100 Congestion control
 101
 102
 103 Simple rate limiting
 104
 105 Plus have to keep internal nodes from overflowing
 106
 107 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 108 %page
 109
 110 Directory servers
 111
 112
 113 Approve new servers
 114
 115 Tell clients who's up right now
 116
 117         plus their keys, location, etc
 118
 119 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 120 %page
 121
 122 Variable exit policies
 123
 124
 125 Each server allows different outgoing connections
 126
 127 E.g. no servers allow outgoing mail currently
 128
 129 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 130 %page
 131
 132 End-to-end integrity checking
 133
 134
 135 In previous onion routing, an insider could change
 136 the text being transmitted:
 137
 138 "dir" => "rm *"
 139
 140 Even an external adversary could do this!
 141
 142 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 143 %page
 144
 145 Rendezvous points
 146
 147
 148 allow hidden services
 149
 150 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 151 %page
 152
 153 Differences / limitations
 154
 155
 156 We're TCP-only, not all IP (but we're user-space and very portable)
 157
 158 Not peer-to-peer
 159
 160 No protocol normalization
 161
 162 %%Not unobservable
 163
 164 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 165 %page
 166
 167 We have working code
 168
 169
 170 Plus a design document,
 171 and a byte-level specification
 172
 173 %size 9
 174 http://freehaven.net/tor/
 175