this post was submitted on 02 Jun 2025
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A private key would be built in to the camera. It would be stored in a way that's hard to get at, physically or in software (like the secure enclaves in phones).
The pics or videos are signed using the private key (again, this process needs to happen in a secure way without revealing the secret key).
The camera manufacturer publishes the matching public key. Anyone can use it to verify that the file matches the signature. But no one can sign a fake image unless they can get at the private key.
This would work even if the camera manufacturer no longer existed. The camera does need to ever be online.
The public/private key pairs are also part of what makes blockchains work, but for this process blockchains would add nothing.
Even if people can't get the key out of rom, which I doubt, they can man in the middle the cable going to the photosensor and inject arbitrary images into the system.