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[–] 17611478? 0 points 3 points (+3|-0) ago 

Q mentioned PixelKnot long ago. It allows a messge to be embedded into an image and a password is needed to see it. I installed the app back then, it's pretty scary at what info can be hidden in a photo.

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[–] 17613776? ago 

“Steganography” is the word for this in general