Public Verification for Private Hash Matching

ePrint Report: Public Verification for Private Hash Matching

Sarah Scheffler, Anunay Kulshrestha, Jonathan Mayer

End-to-end encryption (E2EE) prevents online services from accessing user content. This important security property is also an obstacle for content moderation methods that involve content analysis. The tension between E2EE and efforts to combat child sexual abuse material (CSAM) has become a global flashpoint in encryption policy, because the predominant method of detecting harmful content---server-side perceptual hash matching on plaintext images---is unavailable.


Recent applied cryptography advances …

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