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[liberationtech] Cryptocat Censored in China

Joss Wright joss-liberationtech at
Sat Dec 22 01:50:18 PST 2012

On Sat, Dec 22, 2012 at 09:58:50AM +0200, Nadim Kobeissi wrote:
> I would like to report that Cryptocat is now being censored in China. The
> URLs being 100% blocked are:
> - Cryptocat Project Website:
> - Cryptocat Development Blog:
> We've tweeted an announcement and will probably follow with a
> (non-China-accessible :/) blog post:

Hi Nadim,

Any information on how the blocking is showing up? (DNS or IP based, for

Just out of curiosity I ran DNS queries for a set of about 200 servers
scattered across China, based on some other censorship probing I've been
doing. I haven't had time to go over the results in detail, but I'm
seeing roughly 40% returning (correct) IP addresses, 40% giving invalid
nameserver errors, with all other response types (timeouts, etc.)
scattered over the remaining 20%.

I haven't seen any IP misdirection, which has been the most common
response type for things blocked at the DNS level in my past

I also haven't had a chance to check what sort of correlation there is
between the and results. I'd be
interested to hear more, especially as the methods being used to block
things are apparently undergoing a bit of a shift at the moment.


Joss Wright | @JossWright

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