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A comment on Show HN: Neural-hash-collider – Find target hash collisions for NeuralHash. Parent comment

Re:Show HN: Neural-hash-collider – Find target hash collisio... by ehsankia on Thursday August 19, 2021 @01:11AM (#28230562)
Can't they just make a new one and recompute the 2nd secret hash on the whole data set fairly easily?

Also, the whole point is that it's fairly easy to create a fake image that collides with one hash, but doing it for 2 is exponentially harder. It's hard to see how you could have an image that collides with both hashes (of the same image mind you).

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Re:Show HN: Neural-hash-collider – Find target hash collisio... by ummonk on Thursday August 19, 2021 @02:30AM (#28231004)
Two hash models is functionally equivalent to a particular type of one double-sized hash model. So it shouldn't be any harder to recompute against a 2nd hash, if that 2nd hash were public.

Of course, it won't be public (and if it ever became public they'd replace it with a different secret hash).

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Re:Show HN: Neural-hash-collider – Find target hash collisio... by snovv_crash on Thursday August 19, 2021 @01:47AM (#28230747)
If you have both models it is easy. If Apple manages to keep the server model private then it is hard.
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