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 (tenth from right).
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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