Ok, a few things to at least narrow it a wee bit.
A) It's not unbreakable (ie. one-time pad), 'cause what's the fun of a riddle/clue if there's no way to answer it
B) It's not random garbage, nor have I inserted anything 'random' into it - see above
C) This is a legitimate pattern, that has been used in the past. (ie - I didn't make up the format)
That help at all?