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Re: [tor-bugs] #20216 [Metrics/Censorship analysis]: Iran blocking of vanilla and obfs3, 2016-08 and 2016-09
#20216: Iran blocking of vanilla and obfs3, 2016-08 and 2016-09
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Reporter: dcf | Owner:
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Metrics/Censorship analysis | Version:
Severity: Normal | Resolution:
Keywords: censorship block | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by joss):
Hi All,
Just for a little extra context, we also have code to run the anomaly
detection system on both normal and bridge usage, and only report a period
as anomalous when there is an anomalous drop in normal usage and a
corresponding anomalous rise in bridge usage. (Or vice versa, actually.)
The nice thing about the system we're working with here is that it's
designed to exclude anomalies that are seen over a reasonable number of
other countries, so it should only highlight per-country anomalies in
usage.
As noted, Iran did experience this combined bridge/normal anomalous
period, but there's been a quick drop back to non-anomalous behaviour for
combined bridge usage. I really should be running this on the per-
transport graphs...
For isolating events like this in the future, I'd be happy to work at
getting this code running with regular outputs like the infolabe-anomalies
mailing list that David mentioned. I'm wary of flooding too much data
out there, though. Do let me know if there's something that would be of
particular interest.
I could just output a list and output graph every day for any country that
experiences these 'combined' anomalies. Over the five years of data we
have, and 102 countries that meet our data criteria, we've spotted about
480 events where there are both types of anomaly simultaneously, so these
events are relatively rare.
I'll attach a recent combined anomaly Iran graph for reference.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20216#comment:5>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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