The operator would type a letter on the normal-looking keyboard a couple of seconds later, via an electric current sent through the rotating code-letter wheels, another letter on the adjacent keyboard would be illuminated. The principle of Enigma was that the machines both enciphered messages and, at the other end, deciphered them. McKay's primary focus is on what took place at Bletchley Park, a country house in wartime Britain that was converted into a top-secret facility with the purpose of decrypting the Enigma coding technology used by the Nazis. In the Summer 2008 issue of The Objective Standard, John David Lewis concluded his review of Sun-tzu: Art of War with this important truth: "War is fought with wits as well as with weapons, and the way to victory is to use one's mind to defeat one's enemy." In The Secret Lives of Codebreakers: The Men and Women Who Cracked the Enigma Code at Bletchley Park, Sinclair McKay relays how this truth played out in Britain's relentless fight against Nazi Germany.
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