[tor-bugs] #7532 [pyobfsproxy]: Obfsproxy: Count unique IPs in an anonymous way

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#7532: Obfsproxy: Count unique IPs in an anonymous way
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 Reporter:  asn          |          Owner:  asn
     Type:  defect       |         Status:  new
 Priority:  normal       |      Milestone:     
Component:  pyobfsproxy  |        Version:     
 Keywords:               |         Parent:     
   Points:               |   Actualpoints:     
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 Currently, pyobfsproxy (and obfsproxy) keep a list of IPs (or IP hashes)
 in memory to count connected unique IPs.

 Velope suggested that we should find a more privacy-preserving way of
 counting unique IPs, and he is right.

 Aaron suggested to look into https://git.eff.org/?p=cryptolog.git
 and nick suggested to "use a bloom filter; count bits; get a probabilistic
 answer".

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7532>
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