this post was submitted on 28 Aug 2023
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In my utopia world, the FBI has a team updating the DB.
The utopia algorithim would do multiple subsets of the picture so cropping or watermarking wouldn't break the test (assume the 'crux' of the CSAM would be most likely unaltered?) , maybe handle simple image transformations (color, tint, gamma, etc.) with a formula.
What you're talking about is digital (aka forensic) watermarking.