Apple has added two-factor authentication to iMessage and FaceTime, adding an extra dose of password security to two important iPhone and Mac features.
Two-factor authentication sounds simple enough, but it actually adds a good deal more protection to an account. In most cases, it is a second, one-time code that is used with your permanent password. The code is typically sent in a text message to a user’s paired smartphone when someone tries to log in to an account. So a hacker who cracks the password would have nothing without the other, randomly generated password
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