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A comment on Apple Clarifies Why It Abandoned Plan to Detect CSAM in iCloud Photos. Parent comment

Re:Apple Clarifies Why It Abandoned Plan to Detect CSAM in i... by Manuel_D on Friday September 01, 2023 @07:03PM (#37357059)
I don't think it's an MD5 or SHA512 hash, since just changing one pixel would be enough to evade the scanner. My understanding is that it's heuristic similarity detection, which has a much wider footprint for collisions.
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Re:Apple Clarifies Why It Abandoned Plan to Detect CSAM in i... by sebstefan on Monday September 04, 2023 @03:15AM (#37377966)
It was a hashing technique that would output similar outputs with similar inputs, maximizing collisions rather than minimizing it

That's why people were initially all up in arms about

But they didn't need to do that.

A regular hash where "just changing one pixel would be enough to evade the scanner" is already good enough

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