In upcoming versions of iOS and macOS, the new Find My feature will broadcast Bluetooth signals from Apple devices even when they’re offline, allowing nearby Apple devices to relay their location to the cloud… it turns out that Apple’s elaborate encryption scheme is also designed not only to prevent interlopers from identifying or tracking an iDevice from its Bluetooth signal, but also to keep Apple itself from learning device locations, even as it allows you to pinpoint yours.

WIRED with a fascinating explanation of an utterly fascinating scheme.