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A comment on Apple confirms it uses Google cloud for some of iCloud. Parent comment

Re:Apple confirms it uses Google cloud for some of iCloud by kudokatz on Monday February 26, 2018 @10:54AM (#16466148)
> Each file is broken into chunks and encrypted by iCloud using AES-128 and a key derived from each chunk’s contents

this is exactly the strategy described at the Google Cloud Summit 2017 relating to how security is managed for their platform ... so it lines up

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Re:Apple confirms it uses Google cloud for some of iCloud by delroth on Monday February 26, 2018 @04:59PM (#16469355)
Disclaimer: I work at Google, not on cloud.

I think this is just coincidence though. Apple most likely performs their own layer of encryption on top of what Google already does.

They protect against two different attack scenarios: Google doesn't want plaintext data to show up on disks. Apple doesn't want plaintext data to be accessible by anyone at Google (or any other 3rd party provider).

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