[euphoria83]

If the fingerprints between an actual CSAM photo and a cropped/resized/grey-scaled version can match, it implies that the fingerprint is essentially composed of smaller fingerprints of tiny squares within a picture, as well as of fingerprints of the entire image in both its original as well as grey-scale form. It probably will also need to allow for rotation.

With all of these possibilities allowed, either the matching technology will miss most slightly-deformed matching images (criminals will quickly find effective minimal distortions), to avoid too many false positives, or will end up matching too many of people’s personal images that consist of their young kids in a state of undress (whose parents don’t have a picture or 2 of them in such a state from their childhood?).

So, either this technology is ineffective and not worth the potential misuse, or it is a grave threat to privacy.

[therealmarv]

I would recommend looking at how hashing of images works (there are special algorithm and concepts for it). Good reference e.g. https://github.com/JohannesBuchner/imagehash#references

[stjohnswarts]

Actually it’s both without question.