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[liberationtech] popular circumvention tools have been blocked in Iran

Joseph Lorenzo Hall joe at cdt.org
Wed Feb 10 15:00:06 PST 2016


So so so helpful, Collin!

On Wed, Feb 10, 2016 at 1:58 PM, Collin Anderson
<collin at averysmallbird.com> wrote:
>
> On Wed, Feb 10, 2016 at 11:09 AM, Joseph Lorenzo Hall <joe at cdt.org> wrote:
>>
>> Do we have any indication as to how they are blocking (e.g., given Iran's
>> past history, I'd tend to think it involves fingerprinting circumvention
>> tech protocols). best, Joe
>
>
> I don't believe its traffic classification on circumvention tools; the
> proliferation of obfsproxy-style and meek transports beyond Tor seems to
> made this more difficult. For the particular tools that I have checked, it
> appeared to be enumeration of network entry points through the censors
> running the tool or collecting aggregated network statistics from users, and
> then blocking found addresses. In certain cases, this layer three blocking
> and in others through in-line blocking on the application layer. In the
> latter scenario, the intention seems though to simply block SSL connection
> for addresses, and nothing more fine grain, e.g. whitelisting/blacklisting.
>
> Would be happy to test any tools, maybe FreeGate is next.
> --
> Collin David Anderson
> averysmallbird.com | @cda | Washington, D.C.
>
> --
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-- 
Joseph Lorenzo Hall
Chief Technologist, Center for Democracy & Technology [https://www.cdt.org]
e: joe at cdt.org, p: 202.407.8825, pgp: https://josephhall.org/gpg-key
Fingerprint: 3CA2 8D7B 9F6D DBD3 4B10  1607 5F86 6987 40A9 A871

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