Polish cryptographers working in exile in southern France pose for a photo in 1941. The team included Maksymilian Ci??ki (seventh from left) and Gwido Langer (centre back, head just seen), who worked with French intelligence officer Gustave Bertrand (tent
Credit: Anna Zygalska-Cannon
Alan Turing's crucial unscrambling of German messages in the Second World War was a tour de force of codebreaking.
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