The Navajo code, which was not really a new code, was used during WWII.
The Navajo code could not be deciphered because it wasn't a code at all it was the native language of the Navajo.
Explanation:
kalwososkdidjjejsidkekekrkrkwkwkwkwkwkekekekekdkdkrkorofkmrofoekfkfjfpfppepwlwlwp dkfifjrnfkiftkkfofkrjfofooeoosjsksow9owjeoifjfifinfowowpdkjroel jdkfodnfn
