I definitely thought this was going to be storing data as the image. I'd be interesting in the (computational) detection for that. Of course, if you just encod

I definitely thought this was going to be storing data as the image. I'd be interesting in the (computational) detection for that. Of course, if you just encode/decode it, Yahoo could do the same. If you encrypt the data, they could just check to see how high the entropy is. If it's higher than what's plausible for a real photograph, they'd delete it. (using ent [1]) Else, you could use good ole stenography. In researching this response I came across the term Steganalysis[2]. Pretty interesting! [1] http://www.fourmilab.ch/random http://www.fourmilab.ch/random [2] http://en.wikipedia.org/wiki/Steganalysis http://en.wikipedia.org/wiki/Steganalysis