Security

HomeKit identity

HomeKit provides a home automation infrastructure that uses iCloud and iOS, iPadOS, and macOS security to protect and synchronize private data without exposing it to Apple.

HomeKit identity and security are based on Ed25519 public-private key pairs. An Ed25519 key pair is generated on the iOS, iPadOS, and macOS device for each user for HomeKit, which becomes their HomeKit identity. It’s used to authenticate communication between iOS, iPadOS, and macOS devices, and between iOS, iPadOS, and macOS devices and accessories.

The keys—stored in Keychain and are included only in encrypted Keychain backups—are synchronized between devices using iCloud Keychain, where available. HomePod and Apple TV receive keys using tap-to-setup or the setup mode described below. Keys are shared from an iPhone to a paired Apple Watch using Apple Identity Service (IDS).

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Apple Platform Security

HomeKit identity