Comment by yjftsjthsd-h
3 days ago
And how do you fix the analog hole? Because if you can point your "verified" camera at a sufficiently high-resolution screen, we're worse off than when we started.
3 days ago
And how do you fix the analog hole? Because if you can point your "verified" camera at a sufficiently high-resolution screen, we're worse off than when we started.
There are some techniques to detect recapture, e.g.: Moiré Pattern, Glare, JPEG Grid Artifacts, Channel Phase Shift, Screen Emission, Chromatic Aberration. If those are combined, the effort and cost to fake a photo rises significantly.
Yes, I’m more worried about the false confidence such technology could create. Implement an authenticity mechanism and it will be treated as truth. Powerful people will have the means to spoof photographic evidence.
You can have other sensors that tell you it's a screen, maybe require a Live Photo, maybe also upload to a third party service faster than generation is possible? In the end I think we'd end up somewhere like with cryptography: generating a real fake might be theoretically possible but it could be made prohibitively expensive to generate.
Depth sensor information.
Or just extract the certificate from the hardware you own.
That is presumably a very expensive endeavor. We already have hardware that attempts to mitigate this and while I think it's possible for the government it's certainly not trivial.
This is a "solved" problem. Vendors whose keys are extractable get their licenses revoked. The verifier checks the certificate against a CRL.