On September 13th, the Iranian government began blocking The Onion Router (TOR), a system for evading network censorship. On September 14th, the TOR project changed its code so that it wasn't blocked anymore.
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.
How did the filter work technically? Tor tries to make its traffic look like a web browser talking to an https web server, but if you look carefully enough you can tell some differences. In this case, the characteristic of Tor's SSL handshake they looked at was the expiry time for our SSL session certificates: we rotate the session certificates every two hours, whereas normal SSL certificates you get from a certificate authority typically last a year or more. The fix was to simply write a larger expiration time on the certificates, so our certs have more plausible expiry times.
The escalating tariff slap-fight between the United States of America and the People’s Republic of China is messing with so many bottom lines that the only people playing the market and making bank are those with companies that make red ink in their portfolios. Even Apple, a company that pretty much prints its own damn […]
We presume it can tell by the pixels.
This alarmingly funny video shows an “Apple Engineer” explaining the company’s forthcoming $999 monitor stand. This guy is better than the “Downfall” meme! Also funny: to see people who had complained vocally about Apple’s lack of truly “pro” gear denouncing it when it finally came along, because it was too pro. Perhaps Apple should have […]
When it comes to large computer systems, not one of them is fully secure. Even with constant updates to the platforms that keep vital networks humming, there’s always a back door. And companies are willing to pay handsomely to effective bouncers that can keep an eye on them. Call them ethical hackers or white hat […]
So you’ve visited the Kennedy Space Center every year. You’ve watched “The Right Stuff” for the 95th time. There must be something to do while you’re waiting to join Space Force for the next manned mission to Mars or the moon. Here’s a combo that should raise a salute from any fan of space or […]
Looking for a new tablet? If you haven’t upgraded in a while, it might be time to check out the latest iPad Pro for two very good reasons. First, the 2018 model is a real workhorse. The 12X Bionic chip processor means it can handle any task you set out for it, and still have […]