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A comment on A catalog of naturally occurring images whose Apple NeuralHash is identical. Parent comment

Re:A catalog of naturally occurring images whose Apple Neura... by FabHK on Wednesday August 25, 2021 @07:50AM (#28300417)
> Based on their whitepaper, it's a smaller version of the original image,

I seem to recall that the white paper speaks of a "visual derivative" without specifying it further.

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Re:A catalog of naturally occurring images whose Apple Neura... by koolhaas on Wednesday August 25, 2021 @07:57AM (#28300488)
The Technical Summary uses "visual derivative" without clarification, but their Threat Model PDF clarifies it further as thumbnails:

>The decrypted vouchers allow Apple servers to access a visual derivative – such as a low-resolution version – of each matching image.

https://www.apple.com/child-safety/pdf/Security_Threat_Model...

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