Via Tor Project -
Yesterday morning (in our timezones — that evening, in Iran), Iran added a filter rule to their border routers that recognized Tor traffic and blocked it. Thanks to help from a variety of friends around the world, we quickly discovered how they were blocking it and released a new version of Tor that isn't blocked. Fortunately, the fix is on the relay side: that means once enough relays and bridges upgrade, the many tens of thousands of Tor users in Iran will resume being able to reach the Tor network, without needing to change their software.
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There are plenty of interesting discussion points from the research angle around how this arms race should be played. We're working on medium term and longer term solutions, but in the short term, there are other ways to filter Tor traffic like the one Iran used. Should we fix them all preemptively, meaning the next time they block us it will be through some more complex mechanism that's harder to figure out? Or should we leave things as they are, knowing there will be more blocking events but also knowing that we can solve them easily? Given that their last blocking attempt was in January 2011, I think it's smartest to collect some more data points first.
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