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Comment by __blockcipher__ | Hacker News Reader

https://twitter.com/matthew_d_green/status/14231090022805135... and https://twitter.com/matthew_d_green/status/14231094582936289... kind of sums it up. Clearly there is an intent to progress to more than just what's been shared with iCloud. Otherwise there'd be no need for software on the devices themselves at all.

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That is not the only explanation. Involving the device could be considered better because it doesn’t require Apple to build infrastructure to scan all your photos in the cloud, which could be more easily repurposed without user consent.

They scan photos in the cloud now. And do you think Apple will announce and let users opt out of client side scanning changes?

As far as is publicly known, only iCloud Mail was being scanned before this announcement. This is consistent with the lack of overall CyberTip reports from Apple historically (orders of magnitudes lower than comparable platforms).

Articles said Apple scanned iCloud photos last year. I see some of them were updated to be less specific.

The slant I took from that thread is this is the way to comply with known-bad-hash matching requirement while preserving E2E encryption for cloud-stored content: checking hash at an end.

Don’t need to MITM when you put an M at an end.

iCloud photos aren't E2E encrypted now. This could be a way to add E2E encryption while preserving the current level of surveillance. Except the article said Apple can decrypt suspect photos. And it isn't a legal requirement apparently.[1]

[1] https://news.ycombinator.com/item?id=28077619

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