ASCII Art Steganography
bigearcow writes "ASCII art is nothing new, but this site takes it one step further by allowing you to embed another data file within the image. The resulting ASCII art remains printable (i.e. no special unicode symbols) — this means you can print the image out, hang it on your wall, and have it look like an innocent ASCII art when it's hiding a secret document of your choice." You'll need a small (200x200 pixel max) base image from which the ASCII art will be built.
AppEngine quotas explained
have you been defaced today?
We r0mb ya d0nt - 256b intro from 1999, has 200 bytes of additional code hidden in file_id.diz
Um, actually AES does hurt steganography since steganalysis tools have an easier time finding uniformly distributed payloads (such as AES ciphertexts) than somewhat biased payloads (such as standard text).
So, it would be easier to know that you have some data in there, but harder to know what the data is. Your call.
Take a look at this tutorial:
www.citi.umich.edu/u/provos/papers/practical.pdf