Apple's Security Engineering and Core OS teams describe Secure Exclaves, a new isolated runtime in Apple silicon that processes camera and microphone data for ambient sensing—such as HomeView person recognition and 'Hey Siri' detection—without exposing raw audio or video to the main operating system. They detail its L4-derived microkernel, Secure Page Table Monitor, Secure IPC, and formally verified design, calling it the most secure runtime Apple has created.