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I don't know if it will give you a practical solution. But some people have tried to use fully homomorphic encryption to do picture analysis:


I think what you are looking for is "Perceptual Hashing". What I understand from your question is that you need a way for programmatically identifying images even when they have been manipulated beyond human recognition. Their is a Microsoft project called PhotoDNA. I believe the have a cloud API. You may also want to look at this Python example

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