I think Arma is largely wrong about how much damage single intelligence agencies can do against Tor. Sure maybe the french signals intelligence cannot do significant damage against Tor, but the NSA sure as hell can. The GCHQ sure as hell can. Even Sweden sure as hell can. Sweden signals intelligence monitors 100% of communications entering and exiting Sweden. If your Tor circuit has an entry node in Sweden a middle node outside of Sweden and an exit node in Sweden and a destination outside of Sweden, the Swedish signals intelligence agency can certainly link you to your destination. If your Tor circuit has an entry node in the UK and a middle node outside of the Uk and an exit node in the UK and a destination outside of the UK, the GCHQ can certainly link you to your destination. Most worrying is the NSA, if you have an entry node in the USA and an exit node in the USA and a destination outside of the USA, the NSA can certainly link you to your destination. The signals intelligence agencies definitely seem most focused on international traffic, but it is safe to assume that even nation internal traffic is monitored to a large extent. Certainly there are many circuit constructions that are essentially known to be insecure against specific intelligence agencies without them having any need to cooperate with foreign governments. Taking into account the way that traffic is routed through the internet, the situation is even more dire. If somebody in Germany uses an entry node in the USA and an exit node in Canada that sends traffic through the USA on the way to a destination in Singapore, the NSA is going to be able to link that user to their destination without any cooperation from foreign governments. It is deceptive to say that Tor withstands all but global external adversaries. In reality it is more accurate to say that Tor completely fails in the face of a global external adversary. Anybody who can watch entry and exit traffic of a specific circuit can defeat Tor in that instance. Simply looking at open circuits is enough to demonstrate that traffic sometimes takes a path that makes it vulnerable to single intelligence agencies. If the intelligence agency is the signals intelligence agency of Russia or China or Japan then you can see that very rarely will they be able to compromise a Tor circuit from an external position, without cooperation of foreign intelligence agencies. But if the attacker is the USA, or Germany or Sweden or the UK, then you can see that they can compromise a large percentage of Tor circuits, especially the NSA can. Tor is not secure against major signals intelligence agencies in areas that route large amounts of the worlds internet traffic, or in areas where there are a large number of Tor nodes. Thinking otherwise is simply wishful thinking.