Re:Apple plans to scan US iPhones for child abuse imagery
by heavyset_go on Thursday August 05, 2021 @02:06PM
(#28077339)
> The process is described above, but it’s very hard to “innocently” end up with one of those images that they are looking for from the database.
Actually, it's very easy to end up with an image that has a similar perceptual hash to an illegal image.
They are not doing MD5 hashing, they're taking perceptual hashes and then using something like the hamming distance or Levenshtein distance to make a fuzzy match with hashes from illegal images.
I've built products using these methods, and it is incredibly easy to make a fuzzy match based on perceptual hashes from two images that have nothing to do with each other.
Actually, it's very easy to end up with an image that has a similar perceptual hash to an illegal image.
They are not doing MD5 hashing, they're taking perceptual hashes and then using something like the hamming distance or Levenshtein distance to make a fuzzy match with hashes from illegal images.
I've built products using these methods, and it is incredibly easy to make a fuzzy match based on perceptual hashes from two images that have nothing to do with each other.