4 ms·

You could go on the level of Apple - hardware security chip with presigned bootloader + a chain of trust to boot the OS, and the private key stored in a secure

You could go on the level of Apple - hardware security chip with presigned bootloader + a chain of trust to boot the OS, and the private key stored in a secure enclave. Then generate a cert for every second of video or so and embed it into the media format. Don’t sign the video if you detect any foreign hardware.

buildzr 7y ago
You could try but it'd still be possible to just fake it at the sensor level, essentially so the IC would see your video as the analog signal coming in and encode it as if it were any other image. It's basically the "analog hole" of the video world. If you wanted to do the cheap version of this you could probably set up a screen with proper lighting such that it'd line up well enough that screen and sensor pixels matched closely making it near if not completely impossible to tell a screen was involved. Worse, such a signature on a fake video may give people false confidence in it being real, when really it still needs scrutiny especially if a possible state level or dedicated attacker is involved.
- floatingatoll 7y ago
  Nikon’s been offering chip-based video crypto for years, it’s just not popular in consumer-grade hardware yet. If it was, we’d all be up in arms about our devices having a unique fingerprint in every photo (or video) that could be used to track us.
- anbop 7y ago
  You could have onboard acceleration and depth sensors on the camera to make the fake costlier to produce.
- alasdair_ 7y ago
  >If you wanted to do the cheap version of this you could probably set up a screen with proper lighting such that it'd line up well enough that screen and sensor pixels matched closely making it near if not completely impossible to tell a screen was involved. You could make things more difficult by using multiple cameras (and perhaps some other sensors) to detect a 3D scene rather than just a 2D representation, but I agree that it's all ultimately fakeable.

buildzr 7y ago

You could try but it'd still be possible to just fake it at the sensor level, essentially so the IC would see your video as the analog signal coming in and encode it as if it were any other image. It's basically the "analog hole" of the video world. If you wanted to do the cheap version of this you could probably set up a screen with proper lighting such that it'd line up well enough that screen and sensor pixels matched closely making it near if not completely impossible to tell a screen was involved. Worse, such a signature on a fake video may give people false confidence in it being real, when really it still needs scrutiny especially if a possible state level or dedicated attacker is involved.

floatingatoll 7y ago
Nikon’s been offering chip-based video crypto for years, it’s just not popular in consumer-grade hardware yet. If it was, we’d all be up in arms about our devices having a unique fingerprint in every photo (or video) that could be used to track us.
anbop 7y ago
You could have onboard acceleration and depth sensors on the camera to make the fake costlier to produce.
alasdair_ 7y ago
>If you wanted to do the cheap version of this you could probably set up a screen with proper lighting such that it'd line up well enough that screen and sensor pixels matched closely making it near if not completely impossible to tell a screen was involved. You could make things more difficult by using multiple cameras (and perhaps some other sensors) to detect a 3D scene rather than just a 2D representation, but I agree that it's all ultimately fakeable.