Why Build Colossus? (Bill Tutte) – Computerphile

Cracking the code was only half the battle. To keep the upper hand, when using Bill Tutte’s statistical methods, the detailed counting had to be automated – enter Colossus! Professor Brailsford takes up the story.

The professor’s notes:

Bletchley Park Playlist:

Professor Brailsford used the book “Colossus” by B. Jack Copeland and others (Oxford University Press, 2006). Also recommended are chapters 18 and 19 from : “The Bletchley Park Codebreakers” by R. Erskine and M. Smith (eds.) Biteback Publishing 2011

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

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