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Hiding data within plain sight is
steganography
encryption
slack space
covert channel
steganography
Hiding a picture within a picture
Edit: This question is misleading. Steganography is not 'hiding in plain sight.' Only the sender and recipient know the information is contained within the image so it isn't 'plain sight' and the data can be encrypted and put inside the same image. Edit That's exactly what steganography is hiding hidden data in plain sight (whatever medium it's hidden in). For instance, if you hide it in a photo, the message is there while you're looking at the picture, you just don't know it.
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