this post was submitted on 14 Jun 2025
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Video evidence is relatively easy to fix, you just need camera ICs to cryptographically sign their outputs. If the image/video is tampered with (or even re-encoded) the signature won't match. As the private key is (hopefully!) stored securely in the hardware IC taking the photo/video, any generated images or videos can't be signed by such a private key.
So whatever way the camera output is being signed, what's stopping you from signing an altered video with a similar private key and then saying "you can all trust that my video is real because I have the private key for it."
The doubters will have to concede that the video did indeed come from you because it pairs with your key, but why would anyone trust that the key came from the camera step instead of coming from the editing step?
You can enter the camera as evidence, and prove that it has been used for other footage. Each camera should have a unique key to be effective.
So if you create a new key, it won't match the one on am existing camera. If you steal the key, then once that's discovered, the camera should generate a new one.
But if you don't actually check the physical camera and prove that key for yourself, then it can easily be faked by generating a key that is not coming from the camera and is used for the "proof" video and the fake video.
Any self-respecting judge would check, and hopefully most journalists would keep records of these things to prove where the footage came from.