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Documents belonging to Russia's domestic security service have been leaked online after hackers broke into a contractor's network.

The leaked documents reference projects which Russia's Federal Security Service (FSB) had a Moscow-based firm called SyTech work on, including a method to identify people connecting to the internet anonymously. Although at least some of the projects had been publicly tendered and known about, the hackers are believed to have stolen roughly 7.5TB of material detailing them - although it does not appear to be classified. The Tor anonymity service is popular in Russia where the state security apparatus conducts extensive surveillance of domestic internet activity. De-anonymising individuals using the Tor network has been a focus for law enforcement authorities worldwide as criminals abuse the anonymity to trade illegal materials, including drugs and images of child abuse. The group which published the leaked material claimed that the FSB was not trying to de-anonymise Tor for the sake of pursuing criminals, but to prevent Russians from freely expressing their opinion.
Additional anonymous communications were listed as being targeted by SyTech, including the Jabber instant messaging protocol and the eD2k file-sharing network. Digital Revolution, the group which published the material, said the information it gave to journalists was not altered - but had been provided by other hackers calling themselves 0v1ru$.