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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
by ehsankia 5y ago
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).
- snovv_crash 5y agoIf you have both models it is easy. If Apple manages to keep the server model private then it is hard.
- ummonk 5y agoTwo 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).