From my very limited understanding it's some special hash function that's still irreversible but correlates more closely with the material in question, so an AI trained on those hashes would be able to detect similar images because they'd have similar hashes, I think

[–] twelvefloatinghands@lemmy.world 3 points 11 months ago

Perceptual hashes, I think they're called

[–] tryptaminev@feddit.de 2 points 11 months ago (2 children)

could you provide a source for this? that spunds very counterintuive and bad for the hash functions. especially as the whole point of AI training in this case is detecting new images. And say a small boy at the beach wearing speedos has a lot of similiarity to a naked boy. So looking by some resemblance in the hash function would require the hashes to practically be reversible.

[–] twelvefloatinghands@lemmy.world 4 points 11 months ago* (last edited 11 months ago)

Not all hashes are for security. They're called perceptual hashes

Probably a case of definitional drift of the word, because it probably should be just for the security kind.

[–] ElCanut@jlai.lu 3 points 11 months ago

I'm no expert, but we use those kind of hashes at my company to detect fraudulent software Here's a Wikipedia link: https://en.m.wikipedia.org/wiki/Locality-sensitive_hashing