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Be careful with this. The “art” of Steganography is an arms race between people trying to hide data and people trying to find said data. The later group is much better funded, although they also are facing a more difficult task.
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Indeed, since most people would have to have some original file to modify also.Be careful with this. The “art” of Steganography is an arms race between people trying to hide data and people trying to find said data. The later group is much better funded, although they also are facing a more difficult task.
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That leads to the typical 'grab something "random" online' and leaves an easy path to detecting the data.
(use a google image search
)You'd have to generate the original picture offline, modify it, then ensure to destroy all copies of the original.
(and of course understand that what most people would call 'destroy' doesn't actually destroy data)