"Governments have responded by imposing harsh repressive Internet filters, if we can find ways to keep open these channels we can send people the freedom of expression and access to information , "adds the researcher. The typical systems currently Censorship cause users to bypass the blockages redirected by an external server called 'figurehead'. But the sensor can monitor the content of traffic across the network and sometimes also finds and blocks figurehead. In the case of Telex, users install the program and Internet service providers (ISP for its acronym in English) located installed censor overseas teams called Telex stations . When a user wants to visit a site that is prohibited, establishes a secure connection to an HTTP site network, which could be any password protected site that is not blocked. This connection is a decoy. The program marks the connection Telex and Telex order by inserting a tag with a secret code in the headlines of the page. The label uses a cryptographic technique known as "public key steganography."
The user request passes through several devices ISP route, some of which may be Telex stations. These stations have a private key that allows them to recognize the connections labeled Telex customers. The stations divert connections so that the user can go to any website. However, to make it work, "would require the support of countries that are friends of the cause of a free and open Internet," said Halderman . So far the researchers have set up a station in a simulated ISP Telex in his laboratory . They use it to their daily excursions on the Internet for the past four months and tested it with a client in Beijing that was able to watch YouTube in progress even when the site was blocked in your country of origin.