And step 1 is the key (no pun intended) difference with what is described in the linked post. The scheme described in the post is basically a keyless secret spl

And step 1 is the key (no pun intended) difference with what is described in the linked post. The scheme described in the post is basically a keyless secret splitting (steganography), not key based encryption. But adding an image with good random pixels provides the key. The OR-operation of the eye is a really nifty method.