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Apple’s NeuralHash Algorithm Has Been Reverse-Engineered

schneier.com/blog/archives/202

Turns out it was already in iOS 14.3, and someone noticed:

Early tests show that it can tolerate image resizing and compression, but not cropping or rotations.

We also have the first collision: two images that hash to the same value.

The next step is to generate innocuous images that NeuralHash classifies as prohibited content.

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