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Japan's purple machine [pdf]
- Animats 10y agoIs that some student report, or a class handout, or what? The classic work on this subject is "The Man who Broke Purple", a biography of William Friedman. Friedman is probably the greatest name in cryptanalysis. He changed the field from guessing to crunching. (See page 301 of [1]. That's where modern cryptanalysis began. Explanation at [2].) He was also the founder of the National Security Agency. [1] http://marshallfoundation.org/library/wp-content/uploads/sites/16/2014/06/Methods_II_watermark.pdf http://marshallfoundation.org/library/wp-content/uploads/sit... [2] https://en.wikipedia.org/wiki/Index_of_coincidence https://en.wikipedia.org/wiki/Index_of_coincidence