They work separately from the main CPU, and they're used to handle encryption-related operations in a secure, hard-to-tamper chipset. T2 is a secure co-processor that is embedded in modern Apple devices. See it now: MacBook Air (2018) from Apple."This disconnect is implemented in hardware alone, and therefore prevents any software, even with root or kernel privileges in macOS, and even the software on the T2 chip, from engaging the microphone when the lid is closed." "All Mac portables with the Apple T2 Security Chip feature a hardware disconnect that ensures that the microphone is disabled whenever the lid is closed," said Apple in a white paper that detailed T2's security features. This new security feature was announced today at an Apple event held in Brooklyn, New York, where Apple also revealed the MacBook Air 2018, Apple's latest update to the company's successful line of MacBook notebooks.
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