Why did Google require open eyes for Pixel 4 Face Unlock?

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Google Enhanced Pixel 4 Face Unlock Security by Requiring Open Eyes

Google implemented a security update for the Pixel 4's Face Unlock feature, mandating that users' eyes must be open for the device to unlock. This change addresses a significant security vulnerability that allowed the phone to be unlocked even when the owner's eyes were closed, potentially while they were asleep or unconscious. The update began rolling out on Monday as part of an over-the-air update for Pixel devices running Android 10, and users can enable the feature within the Face Unlock settings menu.
Preventing Unauthorised Access During Unconsciousness

The primary motivation behind this security enhancement was to prevent the Pixel 4 from being unlocked by individuals when the owner is asleep or otherwise unable to consciously grant access. Previously, the Face Unlock system could be bypassed even if the user's eyes were shut, raising concerns about unauthorised access to personal data and device functions. This modification ensures that the owner must be actively and consciously engaging with the device for it to unlock.
Addressing a Previously Identified Security Concern

The need for this update arose from international attention drawn to the security flaw approximately six months prior to the implementation. The prior functionality, while potentially offering a marginally faster unlock for the owner, presented a considerable security risk. The decision to require open eyes directly mitigates this risk, prioritising the security and privacy of Pixel 4 users over minor convenience factors.
Rollout and Activation of the Security Patch

The patch that enforces the open-eye requirement for Face Unlock commenced its rollout on Monday. This update is being distributed via an over-the-air (OTA) mechanism to all Pixel devices currently operating on Android 10. Users have the option to enable or confirm this enhanced security setting through the dedicated Face Unlock configuration screen within the device's settings menu.

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Why did Google require open eyes for Pixel 4 Face Unlock?

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