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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: 3, Insightful) by wonkey_monkey on Monday August 10 2015, @10:24PM
This would not bother any pedophile, but even with a single colour for the complete frame, this would give 224 "different" pictures, with 224 different hashes.
There are ways of fingerprinting images which are robust against that kind of thing, along with rotation, scaling, etc. It's (probably) not like an MD5 checksum.
systemd is Roko's Basilisk