@pastanaga - Yeah, one of the interesting things I discovered about the codes used in, I think, World War One was that they realized the best ones were actual, obscure languages, without any relation to English, rather than trying to muddle up English in a code. The problem was that they had no way to truly generate random numbers back then, it all depended on people and people will almost always eventually start favoring particular numbers or letters.
Anyway, they would use Native American speakers to send and receive coded messages because the language was so different in both sentence structure and form to anything else that there was no way for the bad guys to easily translate it. Interesting, huh? I guess that's one way to get a National Security Agency career.