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    Apple Platform Security Guide updated with Unlock with Apple Watch, Magic Keyboard details | AppleInsider

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    Apple has updated its Platform Security Guide, providing more information about how the Unlock with Apple Watch feature in iOS 14.5 and Touch ID on the iMac Magic Keyboard works.

    The company routinely updates the security guide to incorporate information about new features. The Platform Security Guide contains detailed and in-depth information about Apple’s privacy and security mechanisms.

    For example, the update on Monday sheds new light on the secure channel between the Magic Keyboard with Touch ID and the Secure Enclave in an M1 iMac.

    According to Apple, that channel is “established in the factory by using a unique key shared between” the iMac and the keyboard. Apple says it’s the same mechanism that’s used to create a channel between a Secure Enclave and a built-in fingerprint sensor.

    Apple has also offered new details on the cryptography behind the Unlock with Apple Watch feature in iOS 14.5, which allows users to more easily unlock an iPhone with Face ID if they’re wearing a mask. There’s also new information about the security parameters that govern the use of the feature.

    The feature uses the same mechanism as auto unlock for Mac. The guide states that a mutually authenticated station-to-station (STS) protocol that uses long-term keys that are established when the feature is enabled. Once two devices are paired, unique and ephemeral keys are negotiated for each unlock request.

    Apple says the tunnel is negotiated directly between the Secure Enclave is both devices. That means all cryptographic material is kept within that secured box.

    The distance between the two devices must also be two to three meters or less. An iPhone must also have been unlocked at least once since the Apple Watch was placed on a user’s wrist and unlocked. The Apple watch must not be in bedtime mode, and sensors must be able to determine whether the nose and mask of the user are covered.

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    Md Kashif Ali
    Md Kashif Ali
    Hey Guys Its Kashif, Founder of Tech Fire. I spend most of my free time creating content for my YouTube channel and this website. I started my YouTube channel at age 15 and my goal was to teach people what they can do with their gadgets.
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