I thought that the random collision for md5 was way higher than that. If it's th... | Hacker News

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Zababa on Aug 7, 2021 | parent | context | favorite | on: Apple’s new abuse prevention system: an antritust/...

I thought that the random collision for md5 was way higher than that. If it's that low, you're right, this would work. I'm not sure I understand the part about the pertubation.

DSingularity on Aug 7, 2021 [–]

It’s actually 1/(2^128).

If the attacker does not know how the image will be perturbed prior to hashing then he cannot generate an image which matches with known CSAM.

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