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Gerzhus t1_ja95edw wrote

Reply to comment by Disastrous_Court4545 in Facebook and Instagram will help prevent the spread of teens' intimate photos by goki7

Reposting due to automod.

“Known as PDQ and TMK+PDQF, these technologies are part of a suite of tools we use at Facebook to detect harmful content, and there are other algorithms and implementations available to industry such as pHash, Microsoft’s PhotoDNA, aHash, and dHash. Our photo-matching algorithm, PDQ, owes much inspiration to pHash although was built from the ground up as a distinct algorithm with independent software implementation.”

I don’t know if all are open source, some might be proprietary.

Source: meta/fb blog post about how they fight CSAM.

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HanaBothWays t1_ja9wazq wrote

Unless I’m mistaken these are the same hash functions social media platforms use to detect and take down copyrighted media, too.

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