Alan Turing's Enigma code notebook set to fetch $1 m at New York auction

A never-before-seen notebook revealing Alan Turing's calculations as he battled to crack the Enigma code during the Second World War is expected to fetch 1millionat dollars at New York auction.

The book dates back to 1942 when Turing was working at Bletchley Park to crack the Nazi code and it contains some 56 pages of handwritten workings, scrawls and calculations revealing a deep insight into the thinking of British genius, the Daily Express reported.

Turing was a computer scientist, mathematician and cryptanalyst who had a pivotal role in solving the Enigma code, a feat credited with shortening the Second World War by some two to four years.uring's colourful notebook, bought by the mathematician in Cambridge, was two-thirds filled with complicated mathematical workings and theories.

The final third portion of the notebook was written by Robin Gandy, a friend and fellow mathematician, who was given the book by Turing.

The latest anonymous owner of the rare historical document has decided to auction the book on April 13 at Bonhams' Fine Books and Manuscripts sale, in New York.