Hi Phillipp,
> Eric, that's interesting, could you elaborate on that?
> According to my own experience, deep packet inspection in China is still used
I'm not saying China doesn't do DPI. I'm just saying that, from my own
experience living in China for the past three years, DPI doesn’t appear to be
used to inspect the contents of web pages and dynamically block undesirable
content.
I.e. it's easy to register a new domain (call it TestChinaCyberFiltering.org)
and put up onto it a handful of pages which include every possible word and
phrase which we know are problematic to the Chinese censors. Start with the
list of words which trigger censorship and surveillance in TOM Skype (the
wordlist's been repeatedly cracked by researchers at, I think, Arizona). Add
all the content which the good folks at UC-Berkeley’s China Digital Times have
detected cause immediate censorship on Weibo (China’s Twitter-like service).
This should be a total of about 400 words and phrases (almost all only in
Chinese).
Then access those pages from within China.
As far as I can tell, access will be unimpeded.
It appears to me such content won't ever get blocked
unless/until it's indexed in Google. It appears that the Great Firewall is
constantly doing Google searches for undesirable content, then augmenting the
blacklist. It seems to me the actual augmentation happens only after the "bad"
content's been reviewed by a human. And although most of what we read about
involves what's blocked, there do seem to be regular reductions in what's
blocked--perhaps about once a quarter.
But my own tests have been unscientific, i.e. not conducted over
a variety of ISPs, times, and content. It would be interesting (and not
difficult) to do this more rigorously.
Best,
Eric
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