Comment by nullc
1 month ago
> The chance of a hash colliding is near 0%.
The 'chance' is 100% -- collisions and even arbitrary second preimages have been constructed.
> The hashes are for some of the worst content out there, its not trying to detect anything else.
You don't know that because apple developed powerful new cryptographic techniques to protect themselves and their data providers from accountability.
> collisions and even arbitrary second preimages have been constructed.
The chance of a mismatch is 8.63616855509e-78%
If the hash was an atom then you would have to guess which atom in the observable universe it is. That is how likely a collision will happen.
I have posted numerous neuralhash collisions online already[1] and can generate more on demand. The "chance" is 100% because perceptual hashing schemes do not and cannot achieve cryptographic strength.
[1] https://academic.oup.com/cybersecurity/article/10/1/tyad020/... see the girl/dog image on page 12 for one of my examples in the academic literature.