Navajo Code Talkers
The Navajo Code Talkers were a huge part of WWII because they
had a role in every assault that was conducted by the United States Marines.
They transmitted codes in their native language by telephone and radio. The
Japanese couldn’t break this code because they had never heard this language.
The idea of using this form of secure communication came from Philip Johnson.
http://www.history.navy.mil/faqs/faq61-2.htm
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