An anonymous reader writes "The internet control in China seems to have been tightened recently, according to the Guardian [guardian.co.uk]. Several VPN providers claimed that the censorship system can "learn, discover and block" encrypted VPN protocols.
Using machine learning algorithms in protocol classification is not exactly a new topic in the field [scholar.google.com]. And given the fact that even the founding father of the "Great Firewall", Fan Bingxing [wikipedia.org] himself has also written a paper about utilizing machine learning algorithm in encrypted traffic analysis [ieee.org], it would be not suprising at all, if they are now starting to identify suspicious encrypted traffic using numerically efficient classifiers. [springer.com]
So the arm race between anti-censorship and surveillance technology goes on ."