[tor-dev] moved from [Tor-censorship-events] Improving the censorship event detector.

l.m ter.one.leeboi at hush.com
Thu Aug 20 18:36:07 UTC 2015

Hi Joss,

Thank you for the fine paper. I look forward to reading it. Karsten
would be keen on it too (and maybe also your offer) if you haven't
already forwarded it to them. My interest in fixing it is (mostly)
recreational. I have some thoughts on how to proceed, but I'm not a
representative of tor project.



These are well identified issues. We've been working here on a way to
improve the current filtering detection approach, and several of the
points above are things that we're actively hoping to work into our
approach. Differentiating 'filtering' from 'other events that affect
usage' is tricky, and will most likely have to rely on other
measurements from outside Tor. We're currently looking at ways to
construct models of 'normal' behaviour in a way that incorporates
multiple sources of data.

We have a paper up on arXiv that might be of interest. I'd be
to be in touch with anyone who's actively working on this. (We have
code, and would be very happy to work on getting it into production.)
I've shared the paper with a few people directly, but not here on the

arXiv link: http://arxiv.org/abs/1507.05819

We were looking at any anomalies, not only pure Tor-based filtering
events. For the broader analysis, significant shifts in Tor usage are
very interesting. It's therefore useful to detect a range of unusual
behaviours occurring around Tor, and have a set of criteria within
to allow differentiating 'hard' filtering events from softer anomalies
occurring due to other factors.

Dr. Joss Wright | Research Fellow 
Oxford Internet Institute, University of Oxford

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