NSA
15 AUG 2012
DOCID: 4057521UNCLASSIFIED(U) History Today - 15 August 2012FROM: Center for Cryptologic History I Run Date: 08/15/2012(U) In 1941, when the Japanese attacked Pearl Harbor, theΒ·u.s. was unable to read Japanese army codes. Due toilimited budgets and manpower, William Friedman and hisand of army cryptologists were limited in the range ofsystems they could work and, in any case, little interceptof Japanese Army communications was available.Throughout the 1930s they worked and had great successreaki...
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