[tor-bugs] #20348 [Metrics/Censorship analysis]: Kazakhstan blocking of vanilla Tor and obfs4, 2016-06
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Mon Nov 14 18:19:43 UTC 2016
#20348: Kazakhstan blocking of vanilla Tor and obfs4, 2016-06
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Reporter: dcf | Owner:
Type: project | Status: reopened
Priority: Medium | Milestone:
Component: Metrics/Censorship analysis | Version:
Severity: Normal | Resolution:
Keywords: censorship block kz | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by dcf):
Replying to [comment:1 dcf]:
> * A first segment of 1–15 bytes doesn't work.
> * A first segment of 16 bytes works.
> * A first segment of 16 bytes works also for unobfuscated Tor TLS.
> * A first segment of 17 bytes works.
> * A first segment of 32 bytes works.
> * A first segment of 64 bytes is inconclusive (see comment:8)
> * A first segment of 128 bytes doesn't work.
On 2016-11-11 kzblocked reported that something had changed on at least
some of the DPI boxes in Kazakhstan. A first segment of 16 to 32 bytes
doesn't work anymore. The detection seems to happen more often now,
sometimes even before a Tor circuit is built.
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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20348#comment:34>
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