TheCodeBreakers
States peered into the most confidential thoughts and plans of its
possible enemies by shredding the coded wrappings of their dispatches.
Room 1649 housed OP-20-GY, the cryptanalytic section of the Navy's
cryptologic organization, OP-20-G. The page-printer stood beside the
desk of the GY watch officer. It rapped out the intercept in an original and
a carbon copy on yellow and pink teletype paper just like news on a city
room wireservice ticker. The watch officer, Lieutenant (j.g.) Francis M.
Brotherhood, U.S.N.R., a curly-haired, brown-eyed six-footer, saw
immediately from indicators that the message bore for the guidance of
Japanese code clerks that it was in the top Japanese cryptographic
system.
This was an extremely complicated machine cipher which American
cryptanalysts called PURPLE. Led by William F. Friedman, Chief
Cryptanalyst of the Army Signal Corps, a team of codebreakers had
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