(SSPL/Getty Images) Peter Westcombe, founder of the Bletchley Park Trust, explains in detail how the Enigma machine works and how its codes were broken by the code-breakers at Bletchley Park.

This intriguing documentary looks at how mathematician Alan Turing and his dedicated team of experts set about tackling the almost impossible task of cracking the Enigma Code. At full stretch ...

He wrote a trilogy of books called Military Cryptanalytics covering code ... Enigma message is a pretty big hint. If you get some random encoded message, where do you start? The answer is in the book.