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Yeah, couldn’t you simply rephotograph a doctored image off a sufficiently high-res monitor?

• akoboldfrying 3y ago
  You could, but if you got busted doing that, your reputation would take a hit. Everyone would know it was you because you own the camera with that private key. (To wriggle out of it, you would need to claim that either your camera was stolen before the photo was taken, or that Canon/Reuters's private key was compromised. The former claim would be harder if there was, e.g., a second digital signature stored in the JPEG showing that you confirmed your identity with a fingerprint 10 minutes earlier.) Also: Could you, actually? Maybe photos of monitors have "tells" that can be detected with some kind of image processing.
  • mejutoco 3y ago
    In the end it is not too different from the current solution. If Reuters, or a specific photographer, published manipulated images their reputation also takes a hit. There is a wikipedia article and people know it was you.