[generj]

There are probably many possible methods to detect a picture being of a display rather than the real world. The easiest clues are depth of field and focal length metadata mismatching (presumably a macro lens or similar would be needed, and also presuming lens metadata is not spoofable and included in the signed metadata). Color accuracy will be subtly off. Cameras can detect more dynamic range depth than most (any) screens can create particularly for outdoor scenes. That’s just what I can come up with right now - scientists will have a field day publishing techniques to detect pictures of screens.

Inserting fake sensor readings is plausible but complicated enough I doubt any but state actors would or could bother.

Even this standard only raises the cost to create fake images to 100K would be fantastic for journalism and democracy. Much better than the cost being $0.

[jychang]

Typical tech response that ignores the realityy of users: Most leica lenses predate electronics. Lol.

What DoF/focal length metadata?