On-device escrow designs for data at rest: See e.g. https://cseweb.ucsd.edu/~savage/papers/lawful.pdf …
Are you sure you're not confusing iCloud backup in general with iCloud keychain backup?
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Yeah, iCloud Keychain backup is E(iCloud PW) and in a TPM that limits tries before erasure.
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So wait... are you not saying whatever I am saying? I am even more confused now.

https://twitter.com/pvineetha/status/1204457227702145024?s=21 …https://twitter.com/pvineetha/status/1204457227702145024 … - Show replies
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I am not but I mean I also do not remember seeing information about this specific detail in the sense it is unclear whether Apple has access to the actual backups or whether they are essentially 5-gig black boxes to it. Based on what the papers say, it sounds like the latter?
Thanks. Twitter will use this to make your timeline better. UndoUndo
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