Hashing & Fingerprinting

Use hashing and fingerprinting for known-bad content. Learn perceptual hashing (PhotoDNA, PDQ, TMK+PDQF, NeuralHash), audio fingerprinting, hash-sharing programs (NCMEC, GIFCT, Tech Coalition Lantern), false-positive handling and the cost of mis-hashing, hash-list governance, and the integration into the moderation pipeline upstream of model classification.

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6
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Lessons in This Topic

Work through these 6 lessons in order, or jump to whichever is most relevant.

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Hashing Overview

Advanced
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Perceptual Hashing Algorithms

Advanced
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Audio Fingerprinting

Advanced
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Hash-Sharing Programs

Advanced
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False-Positive Handling

Advanced
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Hash-List Governance

Advanced