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The BBC reports that the UK-based Internet Watch Foundation is sharing hash lists with Google, Facebook, and Twitter to prevent the upload of child abuse imagery:
Web giants Google, Facebook and Twitter have joined forces with a British charity in a bid to remove millions of indecent child images from the net. In a UK first, anti-abuse organisation Internet Watch Foundation (IWF) has begun sharing lists of indecent images, identified by unique "hash" codes. Wider use of the photo-tagging system could be a "game changer" in the fight against paedophiles, the charity said. Internet security experts said images on the "darknet" would not be detected.
The IWF, which works to take down indecent images of children, allocates to each picture it finds a "hash" - a unique code, sometimes referred to as a digital finger-print. By sharing "hash lists" of indecent pictures of children, Google, Facebook and Twitter will be able to stop those images from being uploaded to their sites.
(Score: 1) by Francis on Monday August 10 2015, @07:33PM
It is easy, but that would also greatly increase the cost and processing speed. I'm guessing this is just a way of checking huge numbers of photos very quickly. Whenever one matches the description an LEO will go there and see what's happening. These are pedophiles, and most of them are caught because they didn't think things through. For example handing a computer chock full of kiddie porn to a repair shop without deleting or encrypting the porn.
Chances are really good that somebody on the site will slip up and then all of the images will be found.
If the images being rotated starts to be a problem, I'm sure they can do just that. But, at that point, they'd probably need to do more sophisticated things anyways.