If not, a "no" token is released, all you get is a digital head shake. If the representation matches what's stored in the enclave, a "yes" token is released and the Touch ID action is authenticated. That image is converted into a mathematical representation, which is then sent through the hardware channel to a secure enclave. When the sensor detects a finger, it triggers a high-resolution image capture. On an iOS device, there's a capacitive ring around the Touch ID sensor on the new MacBook Pro, the entire Touch ID sensor is capacitive.
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