(To skip straight to the point, go to the bold part.)
This question stems from the idea that when one has practiced a skill long enough, it becomes almost like a "language" to them. An immediate example would be, well, learning a language! At first it's memorization - amigo means male or generic friend - but after using the word enough, it becomes natural - the word friend in your native language. That is, you don't have to translate amigo to friend consciously, if at all.
A less immediate example is counting in Go (where points, or intersections, are counted sometimes in the middle of the game). It's a difficult and arduous process at first, because the intersections are a pain to count. But as you get more used to counting, you begin to see - I can't think of a better word - patterns. This shape means 9 points, this one is 6, this one is 7, etc. This also becomes unconscious with practice.
So after ALL that, what's my point? Suppose you've come up with a simple text cipher that shifts each letter one forward in the alphabet, wrapping around at 'Z'. (So, A->B, Z->A.) After practicing this cipher enough, would it not begin to form a sort of "second alphabet", and, subsequently, a second language?
Can a cipher count as a language in the starting package?
Phew. =)

You can be a cryptographer though I'm not sure there's much call for it in game. There might be, but you'd have to find the right moderator and someone as interested in the art as you are.