[tor-bugs] #20348 [Metrics/Censorship analysis]: kz no need tor, tor no need kz, if anybody want they can to use ultrasurf. cyberoam assists bloody dictatorships.

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#20348: kz no need tor, tor no need kz, if anybody want they can to use ultrasurf.
cyberoam assists bloody dictatorships.
-----------------------------------------+-------------------------
 Reporter:  dcf                          |          Owner:
     Type:  project                      |         Status:  closed
 Priority:  Medium                       |      Milestone:
Component:  Metrics/Censorship analysis  |        Version:
 Severity:  Normal                       |     Resolution:  invalid
 Keywords:  censorship block kz          |  Actual Points:
Parent ID:                               |         Points:
 Reviewer:                               |        Sponsor:
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Comment (by dcf):

 Replying to [comment:60 cypherpunks]:
 > It's time for cypherpunk's kludges, on Write to do something like:
 > {{{
 >       if conn.isServer && conn.num_frame < 7 {
 >               iatDelay := time.Duration(10) +
 time.Duration(conn.iatDist.Sample())
 >               time.Sleep(iatDelay * time.Millisecond)
 >               conn.num_frame++
 >       }
 > }}}
 > Any ideas?

 I now have this kludge running on a separate port on the unused bridge:
 {{{
 Bridge obfs4 23.92.21.42:46223 5AAD72C6AD8548F8236E12C2B9810715FFF32361
 cert=gzj0/RxxMwGxp+CRElTj1jv+mMh3hND74at7UNk3qHtU2B61e54Nf3g41cAu5B5bELDaCw
 iat-mode=0
 }}}
 I had to make some additional changes so that `iatDist` would be
 initialized, you can see the exact patch in attachment:0001-num_frame-
 cypherpunk-kludge.patch​.

 This is what the timing looks like (compare to attachment:timing-unused-
 obfs4iat0.png without the kludge):
 [[Image(timing-unused-obfs4cypherpunkkludge.png)]]

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20348#comment:79>
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