For nothing is hidden that will not become evident, nor anything secret that will not be known and come to light.
See here for decoding.
I had originally wanted to hide a longer message, but the scaling on Autolab (800x600 -> 130x97) messed things up. If you came here expecting something very interesting, I'm sorry to disappoint you. If it makes you feel any better, I wasted several hours on this instead of my 151 pset because of the aforementioned issue.