[tor-bugs] #6045 [Censorship analysis]: Ethiopia blocks Tor based on ServerHello

Tor Bug Tracker & Wiki torproject-admin at torproject.org
Thu Jul 19 22:39:26 UTC 2012


#6045: Ethiopia blocks Tor based on ServerHello
---------------------------------+------------------------------------------
 Reporter:  asn                  |          Owner:          
     Type:  task                 |         Status:  assigned
 Priority:  normal               |      Milestone:          
Component:  Censorship analysis  |        Version:          
 Keywords:  dpi                  |         Parent:          
   Points:                       |   Actualpoints:          
---------------------------------+------------------------------------------

Comment(by phw):

 Replying to [comment:20 arma]:


 > Replying to [comment:19 phw]:
 >
 > > It looks like the DPI boxes now also look for the TLS client hello.
 The server hello continues to be filtered as well. The three bridges
 published in the [https://blog.torproject.org/blog/update-censorship-
 ethiopia blog post] are not blacklisted. They just don't get the user's
 client hello.
 > >
 >
 > True for Tor 0.2.3.17-beta and later as well (on the client-side)?

 The TLS client hello as sent by version 0.2.3.17-beta passes the filters,
 suggesting that the cipher list (of Tor versions < 0.2.3.17-beta) is part
 of the fingerprint.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6045#comment:22>
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