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Gerzhus t1_ja8xc0x wrote

Reply to comment by CrucioIsMade4Muggles in Facebook and Instagram will help prevent the spread of teens' intimate photos by goki7

There are hash functions that work on images that aren’t susceptible to basic alterations. They aren’t the ones you would use for say hashing passwords.

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Disastrous_Court4545 t1_ja8z3x1 wrote

Mind sharing a few of those hash functions?

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Gerzhus t1_ja95edw wrote

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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CrucioIsMade4Muggles t1_ja92h9v wrote

That's good to know. I'm still fairly skeptical. This seems like the literal least effort approach one could take and still claim they are doing something--to the point where I think they will have spent more money advertising their effort than they spent on developing the system itself.

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HanaBothWays t1_ja93hzi wrote

This is the same system that’s used to detect and take down Child Sexual Abuse Material (CSAM). It’s been around for years. Meta is just expanding the criteria for what images (or hashes of images) they will use it on.

The CSAM system was not previously used to detect and take down nude photos that teens shared consensually: now, it is, even if the subject of the photo has since become a legal adult.

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