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Joined 1 year ago
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Cake day: June 13th, 2023

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  • Do you happen to know a good source for information on this?

    Apple released detailed whitepapers and information about it when originally proposed but they shelved it so I don’t think they’re still readily available.

    One in a trillion sounds like a probability of a hash collision.

    Basically yes, but they’re assuming a much greater likelihood of a single hash collision. The system would upload a receipt of the on-device scan along with each photo. A threshold number of matches would be set to achieve the one in a trillion confidence level. I believe the initial estimate was roughly 30 images. In other words, you’d need to be uploading literally dozens of CSAM images for your account to get flagged. And these accompanying receipts use advanced cryptography so it’s not like they’re seeing “oh this account has 5 potential matches and this one has 10”; anything below the threshold would have zero flags. Only when enough “bad” receipts showed up for the same account would they collectively flag it.

    And I was under the impression that iPhones connected to the iCloud sync the pictures per default?

    This is for people who use iCloud Photo Library, which you have to turn on.