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Apple talk about in their technical documentation https://www.apple.com/child-safety/pdf/CSAM_Detection_Technical_Summary.pdf https://www.apple.com/child-safety
by GistNoesis 5y ago
Apple talk about in their technical documentation https://www.apple.com/child-safety/pdf/CSAM_Detection_Technical_Summary.pdf https://www.apple.com/child-safety/pdf/CSAM_Detection_Techni...
page 9 : Synthetic Match Vouchers
They generate false positives themselves to hide their knowledge of the true number of collisions.
- occamrazor 5y agoThanks, I missed that paragraph.
- merpnderp 5y agoIf they don't keep track of which matches are false positives, wouldn't it be possible to be extremely unlucky and pass the threshold with nothing but false positives generated by Apple? This makes things worse not better.
- occamrazor 5y agoNo, the vouchers attached to the fake positives do not provide information for decrypting the images
- merpnderp 5y agoSo then it is possible to determine which vouchers are real and which are fake, and a court can still order a query for everyone with N-1 hits.