If you ask a reasonably informed techhead how you can hide yourself from the comprehensive surveillance by the US National Security Agency (NSA), chances are they'll recommend using Tor, a system for concealing your location on the internet, and therefore your identity. But you'd be a fool to imagine using Tor alone provides a magic cloak of invisibility, as alleged child p-rnographer Eric Eoin Marques recently discovered. The Tor anonymity network started life as The Onion Router, a project funded by the US Naval Research Laboratory intended to help secure naval communications. Now it's run by the Tor Project, a US-based non-profit with a diverse funding base including the US and Swedish governments, the US National Science Foundation and myriad small donors. What the hell is it?

Images from Tor Project