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You didn’t watch the video did you. That’s not how it works. The key is your device passcode.

• dogma1138 9y ago
  The key for the backups can’t be the device passcode because the device passcode protects the key stored in the Secure Enclave on the device that is the local encryption key also 6 digits isn’t nearly enough entropy for any key derivation algorithm. I can download a backup from iCloud and unpack it in any device or use a 3rd party application to view to content of the backup and the only thing I need is the Apple account password used for iCloud.
  • abalone 9y ago
    "We have a feature called iCloud Keychain Backup, and here's what we do. We have a new credential, the iCloud Security Code, and most often this is the device passcode." - Apple security architect, in the aforelinked video, which you still didn't watch