Professor Brailsford rounds up the whole Colossus affair, and explains how Turing actually played a small but significant part in Bill Tutte's work. Colossus Playlist:    • Bletchley Park (Colossus) Playlist   Enigma Playlist:    • Alan Turing and Enigma   What Happens When I Press a Key?: Choosing a Password: https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com/