Apple this week launched two-factor authentication for iCloud and Apple IDs.
The optional feature will require users to verify their identities beyond providing their passwords when: signing in to an Apple ID to manage an account; buying something on iTunes, the App Store, or iBooks; or getting Apple ID-related support from Apple.
"Turning on two-step verification reduces the possibility of someone accessing or making unauthorized changes to your account information at My Apple ID or making purchases using your account," Apple said on its support website.
If you sign up for two-factor authentication, Apple will send a four-digit code to a trusted device capable of receiving such messages (like your iPhone) every time you try to sign in to your iCloud or Apple ID account, which you will have to enter as well as your standard password. [Screenshot]
Continued : http://www.pcmag.com/article2/0,2817,2416929,00.asp
Also: Apple follows Google, Facebook, and others with two-step authentication
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