MICHAEL ZHANG, PETAPIXEL:
"Here’s a fascinating (but very heady) video by Computerphile, which recently sat down with image analyst Dr. Mike Pound of the University of Nottingham to talk about the subject of digital image steganography.
"Steganography is the practice of hiding one piece of content inside another. In this case, Pound talks about the idea of being able to kind all kinds of content inside digital photograph files."
This is fascinating stuff. Learn how this thing works, and watch the video, here.