The two security methods are similar in many ways, but two-factor authentication automatically sends a six-digit verification code to all trusted devices registered to a given Apple ID, whereas two-step verification manually prompts users to send a four-digit code to any SMS-capable trusted device registered. Two-factor authentication requires an Apple device with iOS 9, OS X El Capitan, watchOS 2, any tvOS version, or later. Apple recently emailed Apple ID users with two-step verification enabled to inform them that, upon installing iOS 11 or macOS High Sierra, they will be automatically updated to its newer two-factor authentication method.Īpple introduced two-factor authentication in 2015 as an improved version of its two-step verification method for securing an Apple ID account with both a password and a secondary form of verification.
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