iCloud Keychain overview

iCloud Keychain allows users to securely sync their passwords between iOS and iPadOS devices and Mac computers without exposing that information to Apple. In addition to strong privacy and security, other goals that heavily influenced the design and architecture of iCloud Keychain were ease of use and the ability to recover a Keychain. iCloud Keychain consists of two services: Keychain syncing and Keychain recovery.

Apple designed iCloud Keychain and Keychain recovery so that a user’s passwords are still protected under the following conditions:

A user’s iCloud account is compromised.
iCloud is compromised by an external attacker or employee.
A third party accesses user accounts.

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iCloud Keychain overview