The fellow investigates the underlying mechanisms used by China’s Great Firewall (GFW) to identify and block various popular censorship circumvention protocols.

There have been many reports from the users that their censorship circumvention servers were blocked. At the same time, preliminary experiments suggest that these censorship circumvention servers have been actively probed by the GFW. Through the fellowship, the researcher identifies how China’s Great Firewall inspects and dynamically blocks any seemingly random traffic in real time based on passive traffic analysis without relying on its well-known active probing infrastructure. You can read the full report here.