[tor-bugs] #5028 [Ooni]: Tor bridge scanning

[Tor Bug Tracker & Wiki]

#5028: Tor bridge scanning
----------------------------+-----------------------------------------------
    Reporter:  hellais      |       Owner:  runa                     
        Type:  project      |      Status:  closed                   
    Priority:  normal       |   Milestone:  Sponsor F: March 15, 2012
   Component:  Ooni         |     Version:                           
  Resolution:  implemented  |    Keywords:                           
      Parent:               |      Points:                           
Actualpoints:               |  
----------------------------+-----------------------------------------------
Changes (by karsten):

  * status:  assigned => closed
  * resolution:  => implemented


Comment:

 Summarizing this sponsor F deliverable:

 We developed a tool for scans of bridge lists which attempts to either
 open a simple TCP connection to the bridge's OR port or that will perform
 a full Tor handshake to the bridge.  We tested the scanner by running a
 [https://trac.torproject.org/projects/tor/ticket/5028#comment:35 scan from
 .de] and comparing results to bridge reachability information obtained
 from the bridge authority in .nl.  We also performed a
 [https://trac.torproject.org/projects/tor/ticket/5028#comment:45 scan from
 .cn] and found that over 80% of bridges were unreachable.  We compared
 active scan results to
 [https://trac.torproject.org/projects/tor/ticket/5028#comment:48 passive
 usage statistics] and confirmed that bridges that were found as
 unreachable in the scan also reported significantly fewer connections from
 .cn than other bridges.

 I'm closing this project ticket.  Any further discussion or analysis
 should go in a new ticket.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5028#comment:49>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online