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this post was submitted on 24 Jul 2023
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Technology
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I agree, but who's going to pay for it? Those aren't just freely available additions to any application that you only need to toggle on.
One way to do this is to block hashes. This is a slippery slope though because it could be used maliciously. Only way to do this and protect freedom of information is to make this fully open source.
Block hash lists then? Something like a community driven hashlist for CSAM would work, of the majority of federated instances report it as that type then it would get added to the list. Instances could then choose what lists they wanted to block.
...instances could also show what lists they subscribe to so they users could see what sort of moderation they choose
So the standard approach to this is so-called "perceptual hashing." Effectively, using cryptographic hashes (sha256, etc.) doesn't really work well in this case. Given a piece of illegal content, that content is likely to still be just as illegal with a single pixel changed -- however, it'll have a completely different cryptographic hash. So instead, a hash function that determines how "similar-looking" two images are, ignoring things like dimensions, color palette, JPEG compression artifacts, etc. This is obviously way fuzzier, and is prone to both false positives and negatives.
Because all this is inherently kinda fuzzy, the exact database of hashes is usually "secret sauce" if you will. If it were public, it would be super easy to circumvent. As an example, given an illegal image:
As a result even "public" databases are distributed with NDAs etc. This obviously does not jive well with an open source, federated network like Mastodon, and I have my doubts as to how willing the relevant agencies would be to give their databases to every rando with $5 to spin up a Pleroma instance on a VPS. A public DB might help in some cases, but unfortunately more illegal content is produced every day, and so it would be extremely hard to keep up with the bad actors.