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Kvantti Hietaniemi wrote on Mon, 11 Mar 2002 about following: > Cryptography where every alphabet is given a number is sometimes credited to > ancient Romans, indeed, so called caesar-shift, otherwise known as ROT13 in the modern times. but.. Romans using rot13 was the first documented use of substitution cipher for _military purposes_. Kama-sutra, then again, has one of the earliest written descriptions of using encryption by substitution. Supposedly women should study various arts, and among them is mlecchita-vikalpa, the art of secret writing. hmm i recently re-read "the code book" by simon singh, from where you can find more about this sort of stuff. excellent book. sakke
