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This has technically been proven false: > Microsoft says that the "PhotoDNA hash is not reversible". That's not true. PhotoDNA hashes can be projected into a 2
by judge2020 5y ago
This has technically been proven false:
> Microsoft says that the "PhotoDNA hash is not reversible". That's not true. PhotoDNA hashes can be projected into a 26x26 grayscale image that is only a little blurry. 26x26 is larger than most desktop icons; it's enough detail to recognize people and objects. Reversing a PhotoDNA hash is no more complicated than solving a 26x26 Sudoku puzzle; a task well-suited for computers.
https://www.hackerfactor.com/blog/index.php?/archives/929-One-Bad-Apple.html#:~:text=I%20have%20a%20whitepaper,possession%20of%20child%20pornography https://www.hackerfactor.com/blog/index.php?/archives/929-On...
- robertoandred 5y agoPhotoDNA and NeuralHash are not the same thing.
- judge2020 5y agoApple 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...
- robertoandred 5y agoMy reading of that is NCMEC provides NeuralHash hashes of their CSAM library to Apple, and Apple encrypts and blinds that database before storing it on devices.