Everyone knows the story of Enigma and secret codebreaking in the Second World War: the triumph of Bletchley Park over world-class cipher technology. Except that excellence in codebreaking was nearly betrayed by incompetence in codemaking. German codebreakers were effective and Allied codes and ciphers were weak. With both sides reading each other's codes, the biggest secret of all - that the codes had been broken - was now at risk...
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History