NSA
RED AND PURPLE
DOCID: 4001123 TOP SECRET UMBRA Red and Purple: A Story Retold (U) (b) (3)-P.L. 86-36 (C-CCO) After studying the techniques used to solve World War II-era Japanese machine cipher systems, a small group of analysts attempted to use present-day techniques to solve these systems. The results were not what one might have expected.
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