In my "Here be Pixels" talk one of the things I showed was how to use a combination of noise and the displacementMap filter to encrypt and decrypt images or data with Flash. In case you didn't see it, here's the principle...
My family name is written Klingemann,
not Klingelmann, Klingeman, Klingaman, Kingemann,
Kindermann, Killingaman, Klingman, Klingmann, Klingonman
Klingemman, Cleangerman, Klingerman or Kleangerman
