[LINK] Skype in/with China is censored/spied upon

[stephen at melbpc.org.au]

<http://www.arnnet.com.au/article/456656/skype_instant_messaging_china_cens
ored_spied_upon/>


The Chinese version of Skype contains spyware that searches for blacklisted 
words and phrases, blocks instant messages that contain them, copies them 
to servers and captures the rest of IM chats that have been flagged in this 
way, according to researchers.

This is all done without being disclosed to customers by the Chinese 
wireless Internet provider TOM Online that distributes the TOM-Skype 
software client.

The behavior of this software is being refined over time to better track 
messages about ever-changing politically sensitive topics as well as other 
categories, according to Jeffrey Knockel, a Ph.D. candidate at the 
University of New Mexico, the lead author of a research paper about the 
client and its behavior.

Paper: <http://cs.unm.edu/~jeffk/publications/foci11tomskype.pdf>

Blocked text: <http://cs.unm.edu/~jeffk/tom-skype/dlist-3.6/LATEST.plain>

The spying and censorship is carried out with the knowledge of Microsoft, 
which owns Skype and its peer-to-peer communications software and describes 
TOM-Skype as "a modified version that follows Chinese regulations."

Knockel and researchers from the University of Toronto are preparing a 
second paper that analyzes shifts in how TOM-Skype responds when it comes 
across keywords and phrases and also how changes to the blacklist over time 
correlate to news events, he says. This analysis may reveal the motivation 
behind the monitoring, although a breakdown of key words gives a hint.

Analysis so far shows 42.2% of the blocked words are associated with 
politics or political dissidents (Tiananmen Square, Gao Zhisheng), 5.2% are 
related to government officials (Zeng Qinghong, Jia Qinglin), and 5.8% have 
to do with information about spying (contact phone tapping software, 
undercover software download). Keywords related to news and information 
sources account for 10.1% (AOL News, Canadian Broadcasting Corporation). 
15.2% are associated with prurient interests, and 7% name specific 
locations (Chun Xi Road McDonald's, Hangzhou Department Store), according 
to Knockel.

Over time, the software has changed its behavior. Earlier, it blocked 
messages that contained trigger words and sent copies of those messages to 
a server. Now more frequently it imposes surveillance on chats that contain 
the words and sends both ends of the conversations to the servers, he says.

This new approach is less likely to tip off users that they are being 
observed and to yield more information, Knockel says. "Surveillance-only is 
much sneakier and harder to detect, and may give them more information 
about what is going down," he says.

Knockel and his colleagues found that TOM-Skype maintains separate lists of 
words that trigger blocking and those that trigger surveillance.

The software is also gathering and reporting more information about who is 
participating in monitored chats. Before it was just the sender's identity, 
but now it also includes the recipient's, which can help track which users 
of regular Skype are communicating with TOM-Skype users, he says.

Knockel routinely posts a "censorship of the day" keyword list culled from 
TOM-Skype and decrypted. The list could be exploited by TOM-Skype users to 
craft messages that avoid the trigger words and so avoid censorship or 
surveillance, he says.

How they did it

One of Knockel's professors suggested that he investigate TOM-Skype as a 
class project. Specifically, he wanted to decrypt the complete lists of 
keywords triggering censorship or surveillance or both and to decrypt the 
surveillance messages that TOM-Skype sends.

He installed TOM-Skype on virtual machines in an Oracle VM VirtualBox 
environment on his laptop and was able to see that the client contained a 
built-in keyword list. The client downloads a new list -- called a keyfile 
-- that replaces the initial keyword list. The new list is encrypted.

To decrypt it the researchers redirected DNS queries from the client to the 
keyfile server to a server of their own where the TOM-Skype client 
downloaded keyfiles crafted by the researchers.

They knew from previous research that a certain swear word was a trigger 
word in the actual keyfile, so they split the file in half, forced it into 
the TOM-Skype client and sent a message containing the word. If the message 
wasn't blocked, that meant that half of the keyfile did not contain the 
swear word encrypted. So they forced the other half of the keyfile into the 
TOM-Skype client and sent the message again to verify that it would be 
blocked, which demonstrated that it contained the word.

They continued doing this, cutting the list in half each time and testing 
against it until they isolated the cyphertext for the swear word.

After a plaintext analysis of the cyphertext, the researchers added single-
character cyphertext words to the list and sending single character 
messages to see what would be blocked. In this painstaking way they figured 
out what cyphertext characters corresponded to plaintext characters.

Knockel used IOActive's IDA Pro software to help reverse engineer TOM-
Skype, and he used WireShark, the open source packet analyzer.

More recently he wrote his own code to carry out DLL injection as a way to 
force the client to accept the keyfiles he crafted by making API calls to 
his servers.

Microsoft is aware of this spying and responded to an emailed query about 
what they think about it in relation to privacy and censorship. This is the 
reply: "In China, the Skype software is made available through a joint 
venture with TOM Online. As the majority partner in the joint venture, TOM 
Online has established procedures to meet its obligations under local laws. 
Even as a minority partner we understand we also have responsibilities. 
Microsoft is working to adopt appropriate changes that can be made to 
address the issues raised. We understand the passion our users have for 
Skype and are committed to taking concrete steps to further increase 
transparency and accountability."

According to a Skype support Web page, TOM-Skype is a custom version of 
Skype used in China. "As our majority joint venture partner, TOM Online 
provides access to Skype for Chinese customers, using a modified version 
that follows Chinese regulations, called TOM-Skype."
--

Here's Google Translate's version of the blacklisted text :-) This list
might indeed get the link archives noticed/read in China if not already.

As a future world leader, we do hope China will use the net responsibly.

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--

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