Schneier - Apple’s NeuralHash Algorithm Has Been Reverse-Engineered
Apple’s NeuralHash algorithm — the one it’s using for client-side scanning on the iPhone — has been reverse-engineered.
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.
This was a bad idea from the start, and Apple never seemed to consider the adversarial context of the system as a whole, and not just the cryptography.
from Schneier on Security https://www.schneier.com/blog/archives/2021/08/apples-neuralhash-algorithm-has-been-reverse-engineered.html
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