The Code Book by Simon Singh is one of the best intros, I think. It covers a lot more than Bletchley, but it gives Bletchley really good coverage and context.

The Code Book by Simon Singh is one of the best intros, I think. It covers a lot more than Bletchley, but it gives Bletchley really good coverage and context. A friend of mine built an enigma machine based on the description and wiring diagrams in the book: http://williamedwardscoder.tumblr.com/post/19946053957/enigma-spreadsheet http://williamedwardscoder.tumblr.com/post/19946053957/enigm...