[tor-bugs] #21468 [Core Tor/Tor]: What is preventing Bridge Enumeration?

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#21468: What is preventing Bridge Enumeration?
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     Reporter:  doelove1      |      Owner:
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: very long term
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 What is preventing an attacker to start up a few mid-nodes and enumerating
 all IPs and substracting those from the list of publicly known entry-nodes
 to get a list of (all) unlisted bridges?

 Seems a lot cheaper than dpi and except for a few false positives due to
 bots pinging it should be quite accurate

 Is this an inherent and known flaw to the bridge infrastructure that we
 have to live with or am i missing some keypoint?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21468>
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