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An American-made Purple Analog Cryptographic System - The U.S. Army’s Signal Intelligence Service cryptanalysts began working on the Purple code in February 1939, making their first successful break into the system in September 1940 when they isolated patterns in the codes.
170117-F-IW100-002.GIF Photo By: 25th Air Force History Office

JOINT BASE SAN ANTONIO – LACKLAND, Texas - An American-made Purple Analog Cryptographic System - The U.S. Army’s Signal Intelligence Service cryptanalysts began working on the Purple code in February 1939, making their first successful break into the system in September 1940 when they isolated patterns in the codes.


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