It would be great if they could use the LiDAR scanner to sign a depth map of the scene in front of the camera. It would show if you photographed a flat image.

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dwattttt 5 minutes ago | parent | next [-]

The 'ol "analog hole". Never been able to patch that gap.

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bayindirh 2 hours ago | parent | prev | next [-]

The sensor already uses phase detection autofocus. You can create a depth map out of it. iPhone X used its dual cameras and that phase data for depth maps.

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ks2048 2 hours ago | parent | prev | next [-]

If that became popular, the AIs would learn how to generate a realistic depth map along with any generated image.

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Gigachad an hour ago | parent | next [-]

The photos are cryptographically signed in the apple image pipeline so it's not as simple as just AI generating something. That said, I can't see how this is any different to all the other times we have embedded crypto keys in consumer hardware where eventually someone finds a way to extract the key and the whole thing is busted open.

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jaggederest 25 minutes ago | parent [-]

Given the whole private cloud bit, I am assuming they keep the private keys server side and never let them out.

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Gigachad 19 minutes ago | parent [-]

That's a good point, You might still be able to trick the cloud to sign your photos, but that's something they could patch in updates without losing control of the key. They could have the server only sign photos taken on the latest ios version.

	▲	jaggederest 11 minutes ago \| parent [-]
		And honestly you could have a similar antitampering oracle that was at least obscured, in terms of "we've detected tampering but won't tell you how or why", which is frustrating but I have to imagine that 99.9%+ of images are clean.

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lokar 2 hours ago | parent | prev | next [-]

How would that work? I thought the premise here is that you can fool the apple camera by taking a (very carefully aligned) picture of a still image (printed out).

A depth map from the apple camera (again, signed) would show that the entire image had the same distance from the camera.

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embedding-shape an hour ago | parent | prev [-]

Even simpler, a 3D printed relief with an image "stamped" on it, now you effectively have a 3D image.

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bayindirh an hour ago | parent [-]

…and the PDAF data will show how shallow it is.

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embedding-shape an hour ago | parent [-]

... don't make it so shallow then. Perfectly possible in a consumer-friendly 3D printer for a face or even human body if you have lots of time for the prints.

	▲	dylan604 39 minutes ago \| parent [-]
		but what are we really trying to solve here. you're suggesting a helluvalota work for what purpose?

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koolala 2 hours ago | parent | prev | next [-]

They could use the camera aperture to take a second photo and calculate blur.

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w4der 3 hours ago | parent | prev | next [-]

And what if you take a picture across a IR-filtered window?

	▲	apetresc 2 hours ago \| parent [-]
		Then you won’t be able to prove it was a genuine photograph? That sounds like the right failure mode.

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mikeaskew4 2 hours ago | parent | prev | next [-]

Pretty sure it does that already.

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selcuka an hour ago | parent | prev [-]

One can 3d-print the AI generated image and photograph that. /s