Two factor authentication in iOS 9

Two-factor authentication systems can deter or defeat attempts to log into accounts remotely, as an attack has to not just have a password, but also access to a device, computer, or phone number belonging to the target account. This turns hacking from “wholesale” to “retail”: unless a flaw is found in the underlying system, each protected account has to be cracked one at a time.

http://www.macworld.com/article/2858347/without-your-recovery-key-your-apple-id-could-be-lost-forever.html

http://www.macworld.com/article/2945781/apple-drops-recovery-key-in-new-two-factor-authentication-for-el-capitan-and-ios-9.html

http://www.macworld.com/article/2933018/apple-steps-up-security-with-native-two-factor-and-6-digit-passcodes-in-ios-9.html

Original Apple :

https://developer.apple.com/support/two-factor-authentication/

What do I need to remember when using two-factor authentication?

To keep your account as secure as possible and help ensure you never lose access, there are a few simple guidelines you should follow:

  • Remember your password.
  • Use a device passcode on all your devices.
  • Keep your trusted phone number(s) up to date.
  • Keep your trusted devices physically secure.

You should also review your account information periodically to make sure everything is accurate and up to date by signing in to your Apple ID account page at https://appleid.apple.com.

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