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CAT | China

This article from Threatpost discusses a study out of CMU of Chinese censorship of their home grown social networking websites.

Now that they are blocking most of the western social media sites entirely, the focus of censorship is internal. Obviously blocking the internal sites as well would defeat the purpose, so they are selectively deleting posts instead. This study looks at the rate at which posts with sensitive key words are removed from the services.

It clearly shows how censorship can be taken to the next level when the censor controls the websites as well as the network.

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Jillian C. York » Haystack and Media Irresponsibility

I have been reading about this “Haystack” anti-censorship tool for a while, but have withheld comment up to now. The above linked article seems to justify my reticence.

This tool has been a media darling, hyped in many different publications, but try as I might I have never been able to find out any solid information about what it actually does. Just a lot of marketing hype.

It now looks like the system was well intentioned snake oil. I still have not seen it, so this is all hearsay. Unfortunately it can be very difficult for the average person to tell the difference. One thing to look for is transparency in security systems. No security system should rely on assuming the enemy will not work out how it operates. It absolutely must be secure even if the opponent knows everything.

Other good signs are the experience and reputation of the author, the length of time the tool has been in use, and published analysis by other independent security experts.

As it turns out, media hype has a very poor correlation with real security.

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Google Runs Into Chinas Great Firewall –

This article reports on an outage experienced by Google users in China. At first Google thought it was due to a technical issue, but now think that it was an intentional outage caused by the Great Firewall of China. It seems likely that this was a retaliation to punish Google for its statements and actions.

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From the Official Google Blog (follow link for the whole post):

So earlier today we stopped censoring our search services—Google Search, Google News, and Google Images—on Users visiting are now being redirected to, where we are offering uncensored search in simplified Chinese, specifically designed for users in mainland China and delivered via our servers in Hong Kong. Users in Hong Kong will continue to receive their existing uncensored, traditional Chinese service, also from Due to the increased load on our Hong Kong servers and the complicated nature of these changes, users may see some slowdown in service or find some products temporarily inaccessible as we switch everything over.

I would expect to see China censor very quickly (which would prevent the re-direct to It will be interesting to see if China will then take the next step of censoring and possibly other Google properties around the world. It would be easy for Google to set up any or all of them to return results in chinese if the browser is detected to be configured in that language.

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Tor partially blocked in China | The Tor Blog

That last article lead me to this post on the TOR blog from September 15, 2009 (I am a bit late to this party). China is now blocking about 80% of the public TOR nodes.

This mostly ends a rather baffling situation where for some reason the Chinese were failing to block TOR even though it was being used effectively for censorship circumvention, the list of nodes is publicly available, and they are no more difficult to block than any other server.

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Official Google Blog: A new approach to China

Google is officially stating that a number of email accounts hosted by Google were attacked from within China. The accounts seem to be mostly connected to Chinese human rights activists. They also state that this is part of a larger pattern extending over a number of other companies.

The most amazing thing about this is the very aggressive pro-privacy stance Google is taking in response to this. They are saying that they will stop censoring search results at That they will talk with the Chinese about how to do this, but are willing to completely pull out of operations in China if they can’t provide un-censored content from within.

The post is worth reading in full. Here are the concluding paragraphs:

These attacks and the surveillance they have uncovered–combined with the attempts over the past year to further limit free speech on the web–have led us to conclude that we should review the feasibility of our business operations in China. We have decided we are no longer willing to continue censoring our results on, and so over the next few weeks we will be discussing with the Chinese government the basis on which we could operate an unfiltered search engine within the law, if at all. We recognize that this may well mean having to shut down, and potentially our offices in China.

The decision to review our business operations in China has been incredibly hard, and we know that it will have potentially far-reaching consequences. We want to make clear that this move was driven by our executives in the United States, without the knowledge or involvement of our employees in China who have worked incredibly hard to make the success it is today. We are committed to working responsibly to resolve the very difficult issues raised.

Wow. We shall see.

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Surveillance of Skype Messages Found in China –

Activists at Citizen Lab, a research group at the University of Toronto, have discovered a massive program of surveillance against Skype in China. Specifically the Chinese are monitoring instant message traffic on Tom-Skype, a joint venture between eBay (the owner of Skype) and a Chinese wireless operator.

It looks like all of the text messages passing through the service are scanned for key words of interest to the Chinese government. This program captures both messages within the Tom-Skype network and between that network and the rest of the Skype network.

This is yet another compelling argument for using strong encryption to prevent interception of message content. People in China can avoid this surveillance by using the non-chinese version of Skype, and using a VPN to get the communications safely out past the Chinese scanners.

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Chinese Bloggers Scale The Great Firewall In Riots Aftermath – In a triumph of low tech, Chinese bloggers are evading the Chinese national censorship system by simply converting their posts to read right to left rather than left to right.Clearly this is only a short term solution, and the government will adapt quickly, but it shows again how brittle these censorship systems are. 

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China won’t guarantee Web freedom over OlympicsHere is an interesting article on Internet censorship during the Olympics. Fortunately for visitors, it is easy to set up secure communication links back to the US before going over. VPN links back to a corporate headquarters outside of China can be a very effective conduit around the censorship. While Anonymizer’s commercial solutions are blocked in China, our censorship circumvention technologies are very effective within the country.  

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CNN to go dark 19 April 2008 1200 GMT according to Chinese Hackers | IntelFusionIn case anyone thinks cyber warfare is a myth, this is more evidence of its reality. It appears that a non-governmental group of Chinese hackers were planning to take down CNN as a protest against their perceived western bias in coverage of Chinese issues. Evidently news of the plans spread too far, and it was called off. 

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