Perceptual Hashing

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Intentionally maximizes the change of hash collision to detect similar images. Used by Google's Search by Image feature or Apple's CSAM. Perceptual Hashing

Algorithms and Their Performances

Zauner

Fastest: block-mean-based perceptual image hash.
Most discriminative: Marr-Hildreth operator-based hash function

Vulnerabilities

It's Not What It Looks Like: Manipulating Perceptual Hashing-based Applications

TLDR: A delicately designed image can fool a perceptual hash application, making it classify two completely different images as the same.

Backlinks2

221218 Letter to Mr. Matt Rickard on 2022-11-28

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