Apple is using a private perceptual hash on the backend, likely to further filter out bad/spam tickets. https://twitter.com/fayfiftynine/status/142789995112049

Apple is using a private perceptual hash on the backend, likely to further filter out bad/spam tickets. https://twitter.com/fayfiftynine/status/1427899951120490497?s=21 https://twitter.com/fayfiftynine/status/1427899951120490497?... Given neuralhash is a hash of a hash, I imagine they’re running photodna and not some custom solution which would require Apple ingesting and hasing all of the images themselves using another custom perceptual hash system. > . Instead of scanning images in the cloud, the system performs on-device matching using a database of known CSAM image hashes provided by NCMEC and other child-safety organizations. Apple further transforms this database into an unreadable set of hashes, which is securely stored on users’ devices. https://www.apple.com/child-safety/pdf/CSAM_Detection_Technical_Summary.pdf#page=4 https://www.apple.com/child-safety/pdf/CSAM_Detection_Techni...