Torguide. How China is Blocking Tor. This study investigated how the Great Firewall of China (GFC) is blocking the Tor anonymity network. Tor is an overlay network which provides its users with anonymity on the Internet. A more detailed explanation is available on the project website or in the design paper. A large number of so-called entry guards and bridge relays serve as the entry points to the network. If these entry points are not reachable, a user finds herself unable to connect to the Tor network. According to recent reports, China's firewall is now able to dynamically recognise Tor usage and block the respective relays and bridges. Effective countermeasures build on a sound understanding of the filtering in place. We reveal how Chinese users are hindered from accessing the Tor network.
This web site contains the published papers, the developed software and the gathered data. Papers We first published a technical report about our findings which was then followed by a peer-reviewed workshop paper. Software Data Contact. Onion Routing. NSA and GCHQ target Tor network that protects anonymity of web users | World news. The National Security Agency has made repeated attempts to develop attacks against people using Tor, a popular tool designed to protect online anonymity, despite the fact the software is primarily funded and promoted by the US government itself. Top-secret NSA documents, disclosed by whistleblower Edward Snowden, reveal that the agency's current successes against Tor rely on identifying users and then attacking vulnerable software on their computers. One technique developed by the agency targeted the Firefox web browser used with Tor, giving the agency full control over targets' computers, including access to files, all keystrokes and all online activity.
But the documents suggest that the fundamental security of the Tor service remains intact. One top-secret presentation, titled 'Tor Stinks', states: "We will never be able to de-anonymize all Tor users all the time. " Another top-secret presentation calls Tor "the king of high-secure, low-latency internet anonymity".