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The reversible restriction is important because otherwise distributing PhotoDNA signatures of CSAM is distributing CSAM.
by batch12 5y ago
The reversible restriction is important because otherwise distributing PhotoDNA signatures of CSAM is distributing CSAM.
- jhgb 5y agoThat seems a little bit extreme unless you mean lossless reversibility, which for a process like this will never be available, as per information theory. Obviously the best thing you get by this process is a smudge of colors which will never pass the "I know it when I see it" test.
- batch12 5y agoMaybe, but is blurry CSAM still CSAM? If not, then they could just distribute the blurry thumbnails instead of this hash.
- jhgb 5y agoIt's not if it can't be distinguished of the same blur of something completely different.
- zionic 5y agoCouldn't you then pipe the lossy thumbnail into something like nvidia's ML tool that creates "real" images from sketches?
- jhgb 5y agoOf course you can. The problem is you almost certainly won't end up with the original image unless the ML tool has been trained with this original image (and even then it might not necessarily appear as an output). There's so many different images it could create from a smudge that there's no reason why the original one should be preferred.