Apple engineers are designing an auto unlock function that would allow an iPhone to unlock a Mac when in close proximity, alleviating the need to enter a password on a password-protected Mac. The feature, which uses Bluetooth LE frameworks, will presumably work similarly to the automatic unlocking function on the Apple Watch, which allows an unlocked iPhone to bypass the passcode restriction on a connected Apple Watch.
The iPhone's Touch ID would likely be used as the login verification method. It's also possible that the Apple Watch could be used to unlock your Mac even when your iPhone isn't present.
Additionally, the new unlocking feature could work alongside Apple Pay support for web browsers with Touch ID on the iPhone being used to verify web purchases made on your Mac.
Apple is expected to unveil OS X 10.12 at WWDC in June; however, not all features for the operating system are set in stone and there is a chance the feature could be held back for a later date. It's also widely rumored that Apple will bring Siri to the Mac with OS X 10.12.
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