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>Video and pictures will soon have no evidentiary value.

This is one bit that has a technological solution. Canon's had some version of this since the early 2000s: https://www.bhphotovideo.com/c/product/319787-REG/Canon_9314...

A more recent initiative: https://c2pa.org/

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This is purely security by obscurity. I don't see why someone with motivation and capability to forge evidence wouldn't be able to forge these signatures, considering the private keys presumably come with the camera you buy.

Shipping secure secrets is also a somewhat solved problem: TPMs ship with EKs that, AFAIK, nobody has managed to extract (yet?): https://docs.trustauthority.intel.com/main/articles/tpm-ak-p...

If you make it expensive enough to extract, and tie the private key to a real identity, then you can make it hard to abuse on scale.

Here I mean that at point of sale you register yourself as owner for the camera. And you make extracting a key cost about a million. Then bulk forgeries won't happen.

But the whole reason video evidence exists is because cameras are cheap and everyone has one as a result.

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