Circuit reconstruction

- [Instructor] The attacks that we've discussed so far … all depend upon eavesdropping on user activity, … entering, or leaving the Tor network. … They assume that the inner core … of the Tor network is well-designed and impenetrable. … While Tor may be well-designed, … that doesn't mean that it's possible … to reach inside that secure core. … Remember, the identities … of nodes on the Tor network are anonymous. … We don't know who's running them. … The nodes that you're using might be run by a hobbyist, … a nonprofit focused on electronic privacy, … or the IT person at a company with some extra servers. … They also might be run by an intelligence agency. … Anyone can set up a Tor node and begin accepting traffic. … The good news is that the Tor network is designed … to be resilient against any … one of these node operators attempting … to eavesdrop on Tor traffic. … That's the beauty of perfect forward secrecy at work. … A node handling a Tor connection only knows the identity … of the node that it receives traffic from, …