[tor-bugs] #8591 [Censorship analysis]: GFW actively probes obfs2 bridges

Sat Apr 13 18:43:15 UTC 2013

#8591: GFW actively probes obfs2 bridges
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 Reporter:  phw                                            |          Owner:  phw
     Type:  task                                           |         Status:  new
 Priority:  normal                                         |      Milestone:     
Component:  Censorship analysis                            |        Version:     
 Keywords:  obfs2, gfw, active probing, censorship, china  |         Parent:     
   Points:                                                 |   Actualpoints:     
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Comment(by phw):

 Replying to [comment:12 asn]:

 > A cheap thing to do would be to test obfs2+brdgrd and see if you get
 active probed. Although, reading Philipp's replies it seems that their
 detection method is so inconsistent that we won't get a clear answer on
 whether obfs2+brdgrd is beneficial.

 I am not sure if brdgrd is still effective. For a number of Chinese users,
 my bridge was probed despite brdgrd running. The tool did its job but the
 scanners showed up nevertheless. So perhaps they are now partially able to
 reassemble TCP streams.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8591#comment:13>
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