What goes on TOR stays on TOR, or so we hope. Dr Mike Pound takes us through how Onion Routing works. This video was formerly called "Onion Routing" EXTRA BITS: End to End Encryption: Deep Web / Dark Web: This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: Computerphile is a sister project to Brady Haran's Numberphile. More at