If you control both the tor entrance and exit nodes, you can unmask the user. Statistically, controlling 300 nodes (~1% of the network) should be enough to unma

If you control both the tor entrance and exit nodes, you can unmask the user. Statistically, controlling 300 nodes (~1% of the network) should be enough to unmask a large number of users. It is not hard to spin up a whole bunch of servers to the mix, and I would find it very hard to believe that the NSA/similar does not already control a substantial portion of the network.