Each device maintains its own list of identities it trusts, and signs this list using one of its identity keys. Device identities in this system consist of two pairs of asymmetric elliptical keys (using P-384), also stored in the keychain. Also stored with the circle are the parameters (random salt and iterations) used to create the key that’s based on the user’s iCloud password.įor two-factor authentication accounts, an additional similar syncing circle is created and stored in CloudKit. The public key of the syncing identity is put in the circle, and the circle is signed twice: first by the private key of the syncing identity, and then again with an asymmetric elliptical key (using P-256) derived from the user’s iCloud account password. The syncing identity consists of a private key and a public key, and is stored in the device’s keychain. When a user enables iCloud Keychain for the first time, the device establishes a circle of trust and creates a syncing identity for itself. iPhone Text Message Forwarding security.How iMessage sends and receives messages.Adding transit and eMoney cards to Apple Wallet.Rendering cards unusable with Apple Pay.Adding credit or debit cards to Apple Pay.How Apple Pay keeps users’ purchases protected.Intro to app security for iOS and iPadOS.Protecting access to user’s health data.How Apple protects users’ personal data.Activating data connections securely in iOS and iPadOS.Protecting user data in the face of attack.Protecting keys in alternate boot modes.Encryption and Data Protection overview.UEFI firmware security in an Intel-based Mac.Additional macOS system security capabilities.recoveryOS and diagnostics environments.
Boot process for iOS and iPadOS devices.Secure intent and connections to the Secure Enclave.Face ID, Touch ID, passcodes, and passwords.
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