The latest in censorship news: Iran is blocking SSL connections. It seems to be pretty basic and targeted filtering so far, so nothing that can't be worked around with some help from non-iranian groups interested in protecting the ability to communicate and organize civilian efforts, but it is a worrying sign that internet monitoring and resulting potential implications for supressing unwanted opinions is again on the rise.
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I have pretty definitive proof that Iran is doing ip-and-port based filtering of SSL.
Filtering is being done by 220.127.116.11 after a hop through 18.104.22.168 / 22.214.171.124. This hop is after my source's ISP, and all three IPs are owned by ITC, Iran's central telco.
Filtering targets all google.com IPs, some but not all torproject.org IPs, probably more. Haven't attempted a broad scan. It's a simple connection drop; filtered connections just time out.
It is not based on SSL handshake signature; testing SSL on nonstandard ports worked successfully, and testing non-SSL on :443 of target IPs was blocked.
I'm not sharing screencaps in order to protect my source, but tests included TCP traceroutes on different IP/port combinations and some simple use of curl.
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