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Isn't it better/easier to go the other way? What if cameras included some kind of secured element that signed real content?

Maybe it would technically be possible to defeat, but we're already pretty good at making it difficult/expensive to extract a private key from hardware.

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That's what Content Authenticity Initiative (CAI) is trying to accomplish.

https://contentauthenticity.org/how-it-works

Keep in mind that CAI can't stop you from pointing your camera at a copied or faked work. There's only so much it can attest to.

You can add depth sensors or lidars. Still possible to fake, but more difficult.

Well, the EXIF data is going to include the focal length at least, I assume all that data is part of the blob being signed. So it would be pretty annoying to make sure the image aligns with what that lens would capture at that focal length, but yes the "analog loophole" strikes again.

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