Prism / NSA - Facebook, Google, Microsoft, Apple, Yahoo - Snowden

http://en.wikipedia.org/wiki/Tor_%28anonymity_network%29
As of 2012, 80% of the Tor Project's $2M annual budget comes from the United States government, with the Swedish government and other organizations providing the rest, including NGOs and thousands of individual sponsors.


. . .Egerstad is circumspect about the possible subversion of Tor by intelligence agencies –

"If you actually look in to where these Tor nodes are hosted and how big they are, some of these nodes cost thousands of dollars each month just to host because they're using lots of bandwidth, they're heavy-duty servers and so on. Who would pay for this and be anonymous?". . .


Researchers from INRIA showed that Tor dissimulation technique in BitTorrent can be bypassed.

In October 2011, a research team from ESIEA (a French engineering school) claimed to have discovered a way to compromise the Tor network by decrypting communication passing over it. The technique they describe requires creating a map of Tor network nodes, controlling one third of them and then acquiring their encryption keys and algorithm seeds. Then, using these known keys and seeds, they claim the ability to decrypt two encryption layers out of three. They claim to break the third key by a statistical-based attack. In order to redirect Tor traffic to the nodes they controlled, they used a denial-of-service attack. A response to this claim has been published on the official Tor Blog stating that these rumours of Tor's compromise are greatly exaggerated.