Bitwarden already has a feature called “Log in with device”. What I am proposing is identical functionality but for unlocking your vault. This would provide a great alternative to manually typing in master password/pin and where biometric unlocks are unavailable - not every desktop machine has a camera or fingerprint reader, but most people will have their phone easily accessible at all times.
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Similar to “Log in with device” feature, provide an “Unlock with device” button under the empty Master Password field.
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To make things smoother, add a “Default unlock method” option in the app/extension settings where you can choose e.g. “Unlock with device” or “Master Password”. With “Unlock with device” option selected pressing a keyboard shortcut to auto-fill a password when the vault is locked would automatically send an unlock push notification request to a mobile device that is authorized to approve unlock requests.
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