• douglasg14b@lemmy.world
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    4 months ago

    It’s not as easy to defeat as just changing the pixel…

    CSAM detection often uses existing features for image matching such as PhotoDNA by Microsoft. Similarly both Facebook and Google also have image matching algorithms and software that is used for CSAM detection which.

    These are all hash based image matching tools used for broad feature sets such as reverse image search in bing, and are not defeated by simply changing a pixel. Or even redrawing parts of the whole image itself.

    You’re not just throwing an md5 or an sha at an images binary. It’s much more nuanced and complex than that, otherwise hash based image matching would be essentially useless for anything of consequence.