[tor-bugs] #18749 [Tor]: Consider only including one fallback per operator

[Tor Bug Tracker & Wiki]

#18749: Consider only including one fallback per operator
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     Reporter:  teor         |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:  Tor: 0.2.???
    Component:  Tor          |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:  small        |   Reviewer:
      Sponsor:               |
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 If we have a large number of fallback directory mirrors, we could make
 sure each operator only sees a small proportion of traffic by only
 including one fallback per operator.

 We could identify operators by:
 * Contact Info
 * My Family

 However, this is easy to break, because it only works for operators who
 correctly configure MyFamily, or use identical ContactInfo fields. (That
 said, these operators can still have their machines compromised.)

 As a workaround, in #17158 I modified the script to output the number of
 fallbacks per ContactInfo. This will note in each fallback entry if an
 operators could see a large amount of client traffic.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18749>
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The Tor Project: anonymity online