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

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#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       |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:  small
 Reviewer:               |        Sponsor:
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Comment (by tscpd):

 Proper configured fallbacks should not get excluded from whitelist. Those
 who are not lie and not leave empty are most likely those we can consider
 to be trustworthy.

 I think AS, adressrange and country are more important values here. This
 could be a great point to add a pile of anonymity and security with a few
 amount of effort: Fallbacks in rare countrys could get extra weight. Same
 with with unique adressrange or fameless ASes. Here could something like a
 diversity weight take place. Some algorithm to rate rarity could possibly
 take place in other cases.

 But even those who are doing proper description should not get assigned
 more than a cap of x% fallback weight. In cases of fallbacks with same
 family / contactinfo get in sum over x% i would tend to blacklist higher-
 weight fallbacks of those. This would reduce the cases of blacklisting
 multiple fallbacks of such a group to get under x% cap which would
 increase diversity again.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18749#comment:3>
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The Tor Project: anonymity online