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Originally Posted by eschwartz
Also, what child pornography hash list?
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I've forgotten the name of the specific task force, but it uses the hash values of child porn, to track the spread of that material.
Perhaps surprising, but typically the hash values do not change, as the material is passed from website to website. (This does not appear to be true for "regular porn".)
The FBI tends to keep mum on precisely how they obtain, and track that material, but during court testimony, the agent implied that there was a team that logged into the various sites on a daily basis, downloading individual files. Personally, I suspect that bots, not humans, are used to download and analyze the images. For starters, it is incredibly boring drudge work. Much easier, faster, and more reliable for a program to analyze and write a report about an image, or video, than a human. The algorithms used in facial recognition software have been adapted to identify people by other body parts.