Yeah, very nice. So this whole idea basically doesn't work - but we get a new stealth way to embed metadata in an image that can be used for tracking...
(And a new narrative why cameras need to have TPMs and locked-down firmware as well)
In days of old, a Polaroid photo was considered "proof of capture".
I've got a Polaroid daylab 35 plus sitting in storage somewhere (https://www.instantoptions.com/wp/faqs/daylab/). You can project a slide through it onto Polaroid film, expose it, and have the image there.
I was also able to find a company that did slide printing. It was possible to send them a digital image and they'd send you back a slide with that image... which I then used to make a Polaroid of that image.
I had a classic 600 Polaroid photo of a UFO landing.
ps:most important: cam/lens settings also in the digital sig, what for a screen is different
However, this will certify only the original image. I think the missing part of this is additional layers of certification which allow some image editing (e.g., rotating, contrast, etc.) yet clearly document that the image was modified and link to the original image ID. Kind of like a signed git log.
You could use this data to prove that image B is an edit of image A if you already have both A and B.
I still think this is a bad idea, because this all requires the images to have some sort of ID - and that seems like a prime target for tracking.
And this still doesn't help any other kind of image e.g. screenshots, photo of a screen etc. that can make the camera signatures largely pointless depending on the context.
Would that ever be relevant for a screenshot?
fitzn•31m ago
merybenavente•6m ago