This installment of the Bletchley Park series has a personal note for Professor Brailsford. He tells us what his dad did in the war. Professor Brailsford's notes: http://bit.ly/ultrasecret Enigma and Turing Playlist:    • Alan Turing and Enigma   Characters, Symbols and the Unicode Miracle: https://www.youtube.com/watch?v=MijmeoH9LT4 The Kindle Text Problem: https://www.youtube.com/watch?v=kzdugwr4Fgk How Gangnam Style Broke YouTube: https://www.youtube.com/watch?v=vA0Rl6Ne5C8 http://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: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels