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Wouldn’t it also just be possible to turn a jailbroken iDevice into a CSAM cleaner/hider? You could take actual CSAM, check if it matches the hashes and keep m

• cyanite 5y ago
  No it’s not. The client hashes against a blinded set, and doesn’t know whether or not the hash is a hit or miss.
• skygazer 5y ago
  I can’t tell what would prevent a jailbroken device from pairing an illegal CSAM image with the safety voucher from a known-innocuous image, since the whole system depends on the trustworthiness of the safety voucher and that it truly represents the image in question. If the device is compromised I would think all bets would be off. To me, one potential flaw of this system may be that Apple inherently trusts the device. The existence of a jailbreak seems like a massive risk to the system. In fact, Apple themselves generate fake/meaningless safety vouchers a certain percentage of the time (see synthetic safety vouchers.) If a jailbroken phone could trigger that code path for all images in the pipeline, apple’s system would be completely broken. On the other hand, this may be just the excuse apple needs to lock down the phone further, to “protect the integrity of the CSAM detection system.” Perhaps they could persuade congress to make jailbreaking a federal crime. Perhaps they’re more clever than I ever imagined. Or perhaps they can fend off alternate App Store talk for sake of protecting the integrity of the system. Or perhaps staying up too late makes me excessively conspiratorial.