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Comment by olegkikin | Hacker News Reader

Try it. Record something off the screen (including the audio), and see what happens. I'm yet to see one example of that that looks like reality.

Emulating a sensor sounds like it immediately reduces the number of perpetrators by orders of magnitude.

I agree though, what I'm suggesting is not 100% bulletproof, but it's using a proven technology, and it's relatively simple, assuming hardware manufacturers are willing to add one small chip to their cameras.

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If you're pretending it's footage of a film, TV show or video game, then recording from the screen will fool a lot of people. And while in a lot of cases that would make the 'metadata' aspect useless anyway, there's always the possibility of a hoaxer either saying:

1. This was recorded from a TV broadcast

2. Or a CCTV camera

Etc.

I've seen a number of YouTube and liveleak videos that were obviously made by recording a security monitor with a phone. Seems to be an acceptable practice for certain genres, and is usually credible.

Which only makes things worse, because if you are trying to create fake security camera footage, you just need to make it real enough to play back on a "security monitor" and record that with a phone camera.

That's not his point. He is claiming he can record a fake video that plays on a screen, and the resulting recording will look like a recording of reality, not of the screen (and the camera will sign it as such).

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