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Tor is a system for users to communicate anonymously on the Internet, but in China, it is also a tool to break the restrictions provided by Great Firewall of China, a powerful censorship system which block lots of websites in and out of China.

There are some reports said that at the end of last month, most part of tor’s service was also blocked by GFC. Also on tor’s web page you can find the corresponding blog and data.

It was said that GFC blocked most of the directory servers of tor, thus a tor user cannot accesses them to get a list of available and trusted onion routers. The user can add bridges manually to avoid being blocked as long as he/she can get a list of them by other means.