Security News > 2021 > August > Apple’s NeuralHash Algorithm Has Been Reverse-Engineered
2021-08-18 16:51
Apple's NeuralHash algorithm - the one it's using for client-side scanning on the iPhone - has been reverse-engineered.
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.