[ooni-dev] Complete list of Tor blocking events

Sadia Afroz sadia.afroz at berkeley.edu
Thu Sep 25 19:47:49 UTC 2014

Hi all,
I am trying find a list of events when different countries blocked Tor to
understand why and how those countries blocked it and how Tor resolved
those issues. Do you know if anybody is maintaining such a list?
I found censorshipwiki (
https://trac.torproject.org/projects/tor/wiki/doc/OONI/censorshipwiki) that
has a similar list. But it seems that it's not maintained any more as it
doesn't have the recent blocking incident by Iran. Also I'm not sure how
comprehensive is this list as it's missing Tunisia.

Do you have any suggestion on how to create a comprehensive list of Tor
blocking by countries?

My colleagues and I were thinking of two ways to go about this:

1. Get the total number of Tor users from every countries over time and
look for anomalous fluctuations. When we created such a graph we noticed
that huge number of bot controlled nodes that appear in almost every
country's graph. It seems hard to identify real censorship events from
graphs like this that can be affected by other events unrelated to

2. Search for tickets on https://trac.torproject.org/projects/tor
<https://trac.torproject.org/projects/tor/ticket/12727> with keywords
related to censorship, for example "censorship", "block", "dpi". This has
the potential problem of missing many events where nobody complained or
filed a bug report with different keywords.

Let me know if there are other places I should look into to find censorship

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