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iCloud Keychain Backup<br />
Premise<br />
New credential—iCloud <strong>Security</strong> Code (commonly device passcode), <br />
unknown to Apple<br />
Generate strong random backup (“escrow”) key, wrap <strong>with</strong> KDF-derived key from iCSC<br />
Back up copy of iCloud Keychain secrets to <strong>the</strong> Apple cloud, encrypted <strong>with</strong> escrow key<br />
Send wrapped escrow key to Apple<br />
In case of device loss or new device, user can recover secrets <strong>with</strong> <strong>the</strong>ir iCloud password<br />
and <strong>the</strong> iCSC
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