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01 September 2022

BFG004: verified recordings

With sophisticated computer models now able to generate convincing fake sounds, photos, and videos, it is valuable to be able to guarantee that a digital recording was produced directly from the physical world by some recording device and otherwise unmodified. This is a scheme for doing so that uses techniques from public-key cryptography. It requires trusting the manufacturers of recording devices as well as the manufacturing process. These trust assumptions can’t be avoided, and they mean that a sufficiently powerful adversary could subvert the system. However, this scheme is robust enough to facilitate verified recordings in practice.