The Prof's Book of Alan M. Turing - Mathematical Theory of ENIGMA Machine

• 160 pages
• Partially in color, according to the historical original document
• Format 6 x 9 "

We did our best to make the original material as readable as possible while preserving its original charm. We hope you enjoy reading this manuscript, which represents a real piece of history.

In late 1940, Alan Turing wrote a report describing the methods he and his colleagues at Bletchley Park used to decrypt the German Enigma cipher machine. At Bletchley this report was known as "The Professor's Book".

A copy of the manual was published in April 1996 under the title "Turing's Treatise on Enigma" thanks to the declassification by the American National Security Agency.

A much better copy of the original from the (British) National Archives, box HW 25/3, has been published below. This publication also revealed the title that had been lost in the American copy: Mathematical Theory of the ENIGMA Machine.

(Although, strangely enough, the report doesn't actually contain any mathematical theory.)