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Cryptology in World War II

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Sarah Bugelholl

on 7 December 2012

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Transcript of Cryptology in World War II

in World War II Cryptology Navajo Code Talkers War in the Pacific The Navajo Indians spoke a language that not many people outside of their tribe knew how to speak.

Their language was unwritten and very intricate, making it difficult to understand.

Philip Johnston came up with the idea to use the Navajo language to send messages during the war. He spoke the language fluently because he learned it while his dad was a missionary to the Navajos.

Johnston persuaded Major General Clayton B. Vogel to use the Navajo language in the war.

Marines recruited 200 Navajos for the job.

A group of Navajos developed words for common military jargon. NAVAJO CODE 1. Say a list of words in the Navajo language
2. Translate each word to English
3. Take first letter of English word Japanese Encryption
American Decryption PURPLE The Japanese had a machine known as Purple to encrypt messages without the Americans knowing the content.

They also had different codes called Red and Blue which the Americans had decoded. MAGIC It took the Americans 18 months to decipher the messages sent via Purple.

William Friedman, along with the U.S. Army's Signal Intelligence Service and the Navy Yard Machine, decoded Purple using a machine they called MAGIC. Battles with the U.S. Marines 1942-1945: N = tsah (Needle)
A = wol-la-chee (Ant)
V = ah-keh-di-glini (Victor)
Y = tsah-ah-dzoh (Yucca) Guadalcanal
Iwo Jima "Were it not for the Navajos, the Marines would never have taken Iwo Jima." -Major Howard Connor, 5th Marine Div. The Japanese never broke the code! Bibliography Navy & Marine Corps WWII Commemorative Committee. Navajo Code Talkers: World War II Fact Sheet. www.history.navy.mil/faqs/faq61-2.htm (accessed November 30, 2012).

Parker, Frederick D. United States Cryptologic History. www.nsa.gov/about/ _files/cryptologic_heritage/publications/wwii/pearl_harbor_revisited.pdf (accessed December 5, 2012). Example: NAVY
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