This post will serve as a living document that tracks the ongoing changes which I make to the Zodiac Killer Cipher Generator.
June 6, 2012
Incorporated David Bau's Math.seedrandom() since, apparently, Math.random() is not seedable by default. I exposed the seed, which is a string, by adding a new input to the controls section.
Now, the same inputs will yield the same cipher (i.e. it's deterministic). To get a different cipher, simply type a different string into the "seed" input.