During the Second World War, American mathematician Genevieve Grotjan Feinstein (1912-2006) was lauded for successfully cracking the code for Purple. What was this?

Answer: ‘Purple’ was the American codename for the Japanese cipher machine, similar to the more widely known Nazi equivalent “Enigma”. Such was the importance of Feinstein’s breakthrough that it is considered one of the greatest achievements in U.S. code breaking history.

Source: An Encyclopaedia of American Women at War by Lisa Frank

More at: History

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