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Seems like this is Apple's current explanation: > Yes. Two-factor authentication is a new service built directly into iOS 9 and OS X El Capitan. It uses differ
by zbuttram 10y ago
Seems like this is Apple's current explanation:
> Yes. Two-factor authentication is a new service built directly into iOS 9 and OS X El Capitan. It uses different methods to trust devices and deliver verification codes, and offers a more streamlined user experience. The current two-step verification feature will continue to work separately for users who are already enrolled.
Wish they would expound a bit more...