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[liberationtech] Many VPNs and Psiphon are currently blocked in Iran right now

Collin Anderson collin at
Sat Feb 22 12:41:40 PST 2014

On Sat, Feb 22, 2014 at 2:58 PM, Brian Conley <brianc at>wrote:

> Sure, and for 25,000 users apparently Tor works at least some of the time.
> We need to understand why tor(and other products) work for these
> individuals & why it doesn't work for others. This is the only way we can
> effectively educate folks and adapt to such constantly changing
> circumstances.
There are 76.42 million people in Iran, half of whom have some Internet
access and within that subset at least a quarter circumvent the filtering,
by the estimation of the Iranian police chief. That *certainly shady* math
implies that the current number of Tor users is something like less than
.3% of filter-circumventing users, a fraction of Psiphon's claims of 3
million unique users a week [1]. While I naturally agree with Nima, this
will not necessarily scale for long because the government has shown an
ability and willingness to shut down unknown traffic streams or suspect SSL
connections. It's my understanding that the TCI is now aware of how to
disrupt Tor again, but is likely sitting the attack on or still testing it
on a small scale.

*Collin David Anderson* | @cda | Washington, D.C.
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