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An anonymous reader writes: Earlier this month, Apple unveiled a system that would scan iPhone and iPad photos for child sexual abuse material (CSAM). The announcement sparked a civil liberties firestorm, and Apple’s own employees have been expressing alarm. The company insists reservations about the system are rooted in “misunderstandings.” We disagree.
We wrote the only peer-reviewed publication on how to build a system like Apple’s — and we concluded the technology was dangerous. We’re not concerned because we misunderstand how Apple’s system works. The problem is, we understand exactly how it works.
Our research project began two years ago, as an experimental system to identify CSAM in end-to-end-encrypted online services. As security researchers, we know the value of end-to-end encryption, which protects data from third-party access. But we’re also horrified that CSAM is proliferating on encrypted platforms. And we worry online services are reluctant to use encryption without additional tools to combat CSAM.
We sought to explore a possible middle ground, where online services could identify harmful content while otherwise preserving end-to-end encryption. The concept was straightforward: If someone shared material that matched a database of known harmful content, the service would be alerted. If a person shared innocent content, the service would learn nothing. People couldn’t read the database or learn whether content matched, since that information could reveal law enforcement methods and help criminals evade detection.
But we encountered a glaring problem.
Our system could be easily repurposed for surveillance and censorship. The design wasn’t restricted to a specific category of content; a service could simply swap in any content-matching database, and the person using that service would be none the wiser.
About the authors of this report: Jonathan Mayer is an assistant professor of computer science and public affairs at Princeton University. He previously served as technology counsel to then-Sen. Kamala D. Harris and as chief technologist of the Federal Communications Commission Enforcement Bureau. Anunay Kulshrestha is a graduate researcher at the Princeton University Center for Information Technology Policy and a PhD candidate in the department of computer science.
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