GreatFire May: Google and Sina Adapt, The Great Firewall Strikes Back

After analyzing our May data, which now covers more than 30,000 URLs, we can confidently say that the month of May was uneventful. Few major websites were blocked or unblocked. Perhaps this lack of activity was related to leadership change in China (and not just at the very top - see Rumors say China's chief internet censor replaced. While the Great Firewall didn't change much, Google and Sina, in very different ways, both took important steps in trying to deal with the pervasive censorship.

Google Strikes - The Great Firewall Hits Back

"We have observed that searching for certain keywords on Google from within mainland China will often lead to a temporary service disruption." 
Google Support, May 31, 2012.

Starting on May 31, Google displayed a warning message to users from China if they enter any of the many keywords blocked by the Great Firewall. Users could choose to continue the search which would most likely result in the connection being reset for a minute or so. Or they had the possibility to edit the search query and find another, non-blocked, way of searching for the same thing.

For the 16.7% of Chinese web users that use Google, the immediate effects of this was that the censorship became more transparent. To make it even more transparent, Google could choose to publish the list of blocked keywords. Meanwhile, we've reverse-engineered the full list. You can also browse our own database of keywords blocked on Google. Another effect was that the user experience improved. Since a reset connection means that you can't use the service at all for about a minute, a warning message is much more convenient. Furthermore, the suggestion function that offers autocompletion of common searches worked better. Try typing "tiananm", for example.

However, after a month of relative inactivity, this got the GFW team to strike back. Within a day, they disabled the new Google feature by blocking the javascript file that contains the code altogether. This of course makes us wonder what Google's next move will be. It would be very easy to rename the file or to embed it on the html page making it more difficult to selectively block features.

Going forward, there is much more that Google can do. Rather than just informing users that a search query has been censored, they could offer ways to get around it. The most obvious one would be to redirect users (automatically or manually) to the encrypted version of Google which is still not blocked in China (

The fact that this functionality was rolled out, and not just on Google Hong Kong but actually any Google search engine that is accessed from China, shows that Google is actively working on ways to get around censorship in China. For more on this exciting game, read Google Confronts the Great Firewall on Foreign Policy and the announcement on the Google Search Blog. was blocked in May which is the only major Great Firewall change during the month which involved Google.

How to get your account closed on Sina Weibo

On May 29, Sina Weibo announced a new user-points system to regulate users (original, interpreted by ZDNetAsia). The concept is that each Weibo user will be given 80 points to start with. Any behaviour deemed inappropriate by censors will cause points to be deducted. If the user reaches 0 points, his or her account will be closed.

Just like with the user contract announced last month, the description of what is allowed and not is very general. So what is a user who wants to get their account closed to do? Here are a few tips:

  1. Post a lot of tweets containing these keywords that are all blocked on Sina Weibo.
  2. For more efficiency, check out these keywords that are blocked not only on Weibo but also on Baidu and Google.
  3. Get some inspiration by checking out copies of thousands of Sina Weibo posts that have been deleted.

In other Weibo news, weibo: 天安门 was briefly unblocked on May 21 but has otherwise been fully blocked before and after. weibo: 郭金龙 was unblocked during the second half of May and has stayed that way since.

New Blocked Keywords

China Digital Times discovered many new blocked keywords. Some of them have been unblocked since, and some are blocked not just on Weibo. Here's an updated overview:

baidu: 巨无霸google: 巨无霸weibo: 巨无霸
baidu: 揭秘google: 揭秘weibo: 揭秘
baidu: 八一广场google: 八一广场weibo: 八一广场
baidu: 色猫google: 色猫weibo: 色猫
baidu: 腌肉google: 腌肉weibo: 腌肉
baidu: 大腿肉google: 大腿肉weibo: 大腿肉
baidu: 剔肉埋骨google: 剔肉埋骨weibo: 剔肉埋骨
baidu: 尸骨google: 尸骨weibo: 尸骨
baidu: 吃受害者google: 吃受害者weibo: 吃受害者
baidu: 吃少年google: 吃少年weibo: 吃少年
baidu: 韩耀google: 韩耀weibo: 韩耀
baidu: 连环失踪案google: 连环失踪案weibo: 连环失踪案
baidu: 雷锋google: 雷锋weibo: 雷锋
baidu: 乌尔google: 乌尔weibo: 乌尔
baidu: 人权google: 人权weibo: 人权
baidu: ren权google: ren权weibo: ren权
baidu: renquangoogle: renquanweibo: renquan
baidu: 晋宁google: 晋宁weibo: 晋宁
baidu: 食人魔google: 食人魔weibo: 食人魔
baidu: 杀人狂google: 杀人狂weibo: 杀人狂
baidu: 吃人google: 吃人weibo: 吃人
baidu: 张永明google: 张永明weibo: 张永明
baidu: 云南失踪google: 云南失踪weibo: 云南失踪
baidu: 肢解尸体google: 肢解尸体weibo: 肢解尸体
baidu: 云南杀google: 云南杀weibo: 云南杀
baidu: 冤案google: 冤案weibo: 冤案
baidu: 猥亵google: 猥亵weibo: 猥亵
baidu: BJ日报google: BJ日报weibo: BJ日报
baidu: 炫富女google: 炫富女weibo: 炫富女
baidu: 马力宏google: 马力宏weibo: 马力宏
baidu: 马驰google: 马驰weibo: 马驰
baidu: 法拉利google: 法拉利weibo: 法拉利
baidu: 新加坡google: 新加坡weibo: 新加坡
baidu: 刘明泽google: 刘明泽weibo: 刘明泽
baidu: 周永google: 周永weibo: 周永
baidu: zy康google: zy康weibo: zy康
baidu: z永Kgoogle: z永Kweibo: z永K
baidu: 朝阳医院google: 朝阳医院weibo: 朝阳医院
baidu: 自行离开google: 自行离开weibo: 自行离开
baidu: 骆家辉google: 骆家辉weibo: 骆家辉
baidu: 医院google: 医院weibo: 医院
baidu: 美大使google: 美大使weibo: 美大使
baidu: 光chenggoogle: 光chengweibo: 光cheng
baidu: guang诚google: guang诚weibo: guang诚
baidu: 政治庇护google: 政治庇护weibo: 政治庇护
baidu: 滕彪google: 滕彪weibo: 滕彪

No Boxer Rebellion on Wikipedia was apparently blocked throughout May but is now available again. en.wikipedia: Huang_Qi was unblocked during May. Chinese users can however access any of the many blocked Wikipedia articles by using the encrypted websites: and remain unblocked.

Foreign Websites Continue To Get Faster

Loading chart..

Showing average download speed of Alexa Top 500 websites not hosted in China, per month. Source.   

Loading chart..

Showing Alexa Top 500 websites blocked 50% or more of the time, per month. Source.

Other Detected Changes was unblocked but is extremely slow. was unblocked and has stayed unblocked. was briefly available on May 13 but has been blocked again since. was unblocked and has stayed that way. 

News on

May was an exciting month for us on We completed the Chinese version of our website, started reaching out on Sina Weibo and Google Plus, introduced a much easier way of looking up and comparing keywords (on Baidu, Google and Sina Weibo) and imported thousands of sensitive keywords from BlockedOnWeibo and China Digital Times. Stay tuned for more. If you want to collaborate with us please email [email protected].


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Thu, Sep 24, 2015

Apple blocked CNNIC CA months after MITM attacks

In March of this year, Google found unauthorized digital certificates for several Google domains. The root certificate authority for these domains was the China Internet Network Information Center (CNNIC). CNNIC was controlled by the Chinese government through the Ministry of Industry and Information Technology and is now under the management of the Cyberspace Administration of China (CAC). CNNIC was recognized by all major browsers as a trusted Certificate Authority. If CNNIC signs a fake certificate used in a man-in-the-middle attack, no browser will warn of any unusual activity unless the certificate is pinned.

Wed, Sep 23, 2015

Malicious Xcode could spread via download manager Xunlei

What’s at stake?

We reported last week that popular Chinese iOS apps were compromised in an unprecedented malware attack. We discovered that the source of the infection was compromised copies of Xcode hosted on Baidu Pan. Apple has published an article urging developers to download Xcode directly from the Mac App Store, or from the Apple Developer website and validate signatures. We’ve now discovered that even if a developer uses a download link seemingly from Apple, he might still be possible to obtain a compromised copy of Xcode.

Please note that we do not have evidence that such attacks has happened. But it is an easy attack that anyone can implement.

How does it work?

This compromise happened because of Xunlei. Xunlei is the most popular download manager in China. Much of its popularity is due to the fact they can accelerate download speeds by pulling resources from other Xunlei users as well as cached copies on the Xunlei server. All of this, however, is invisible to users. Users can simply enter a regular http download address into Xunlei  download manager and the download will start. Chinese developers were using direct download addresses such as to download Xcode.

Mon, Sep 21, 2015



Sat, Sep 19, 2015

Popular Chinese iOS apps compromised in unprecedented malware attack

What happened?

According to recent reports, some versions of Xcode used by developers in China have been compromised and are being used to inject tracking codes in iOS apps without developer knowledge. (1,2). Unaware of the injection, those developers then released their compromised iOS apps to the App Store which were then later approved by Apple. At the time of writing this post, the compromised apps are still available in the App store. Any user who has installed and launched these compromised apps will be a victim of these tracking codes.

This is a significant compromise of Apple’s app store. Apple notoriously manually reviews all app submissions and, in comparison to Android stores, has been relatively malware-free. This is the most widespread and significant spread of malware in the history of the Apple app store, anywhere in the world.

The compromised version of Xcode was hosted on Baidu Pan. It is unlikely that Baidu was aware of the compromised version of Xcode. The company removed the files yesterday when news of the compromise surfaced. Because of slow download speeds from foreign websites in China, many Chinese developers prefer to download apps from domestic websites. Many Chinese also use download software like Xunlei, rather than downloading directly from the official Mac App Store.

According to users reports, many prominent Chinese apps are affected. We have included links to the compromised apps in the list below but DO NOT DOWNLOAD these apps. We are simply linking to them so that users can recognize the apps. Affected apps include:  

Wechat The most popolar messaging app in China 

Wed, Sep 16, 2015



Roya, David, Nick, nweaver, Vern, 和我刚刚完成了关于GFW主动探测系统的研究。这个系统在几年前就被用来探测翻墙工具,比如Tor。我们在之前的博文中介绍过GFW主动探测系统是如何工作的。但有几个问题我们没有回答。比如这个系统的物理结构是怎样的。那些用来主动探测的IP是归GFW所有的么? 有猜测GFW短时间内劫持了部分IP来用来主动探测,但没有证据。这次研究回答了这些问题。


  • 通常来说,如果Tor的某个网桥代理被GFW检测并封锁,它会一直被封锁。但是这意味着网桥代理完全无法访问吗? 我们让中国的VPS一直连接我们控制的网桥代理。我们发现,每25小时,中国的VPS可以短暂的连接到我们的代理网桥。下图显示了这个现象。每个数据点表示中国的VPS试图与网桥代理建立连接。中国联通和中国教育网都有这个周期性现象。有时候,网络安全设备在更新规则时会默认允许所有流量,但我们不知道GFW周期性现象是不是因为这个原因导致的。

  • 我们找到了规律,GFW主动探测的TCP头暗示那几千个IP都来自与同一个地方。下图显示了数据包的初始序号和时间。每个数据点都是一个主动探测连接。如果每个主动探测都是从不同地方发出的,我们应该看到随机的数据点,因为数据包的初始序号是随机选择的。但是下图显示主动探测连接虽然来自不同IP,但是非常有规律。我们认为主动探测的初始序号是按照时间产生的。


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Latest! New Google blocked keyword function back up, working again. Google changed the URL of the JS file. How long before it's blocked again?

The previous URL was,st,anim,bbd,c,sb_cn,hv,wta,cr,cdos... and is still blocked (see

The new javascript file URL is,st,anim,bbd,c,sb_cn,hv,wta,cr,cdos,sk,... and is not blocked (yet?). See for an updated status.

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