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Two Factor Authentication for Apple – iOS 9 and OS X El Captain

two-factor-verification-Apple

How it works

With two-factor authentication, when you enter your Apple ID and password for the first time on a new device, Apple will ask you to verify your identity with a six-digit verification code. This code is displayed automatically on your other devices, or sent to a phone number you trust. Just enter the code to sign in and access your account on the new device.

Once signed in, you won’t be asked for a verification code on that device again unless you sign out completely, erase the device, or need to change your password for security reasons. When you sign in on the web, you can choose to trust your browser so you won’t be asked for a verification code the next time you sign in from that computer.

Trusted devices

A trusted device is an iPhone, iPad, iPod touch, or Mac using iOS 9 or OS X El Capitan that you’ve already signed in to using two-factor authentication. It’s a device we know is yours and that can be used to verify your identity by displaying a verification code from Apple when you sign in on a different device or browser.

Trusted phone numbers

A trusted phone number is a number that can be used to receive verification codes by text or phone call. You must verify at least one trusted phone number to enroll in two-factor authentication. You should also consider verifying other phone numbers you can access, such as a home phone, or a number used by a family member or close friend. You can use these numbers if you temporarily can’t access your own devices.

Verification codes

A verification code is a temporary code sent to your trusted device or phone number when you sign in to a new device or browser with your Apple ID. You can also get a verification code from Settings on your trusted device.

A verification code is different from your the device passcode you enter to unlock your iPhone, iPad, or iPod touch.

What to remember when you use two-factor authentication

Two-factor authentication significantly improves the security of your Apple ID. After you turn it on, signing into your account will require both your password and access to your trusted devices or trusted phone number. 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 Apple ID password.
  • Use a device passcode on all your devices.
  • Keep your trusted phone number(s) up to date.
  • Keep your trusted devices physically secure.

Manage your account

You can manage your trusted phone numbers, trusted devices, and other account information from your Apple ID account page.

Keep your trusted phone numbers up to date

To use two-factor authentication, you need at least one trusted phone number on file where you can receive verification codes. You can update your trusted phone numbers when you follow these steps:

  1. Go to your Apple ID account page.
  2. Sign in with your Apple ID.
  3. Go to the Security section and click Edit.

If you want to add a phone number, click Add a Trusted Phone Number and enter the phone number. Choose to verify the number with a text or phone call, and click Continue. To remove a trusted phone number, click   next to the phone number you want to remove.

View and manage your trusted devices

You can view and manage a list of your trusted devices in the Devices section of your Apple ID account page.

  1. Go to your Apple ID account page.
  2. Sign in with your Apple ID.
  3. Go to the Devices section.

The device list shows the devices that you’re currently signed in to with your Apple ID. Select a device to view the model, serial number, and other useful information, including whether or not the device is trusted and can be used to receive Apple ID verification codes.

You can also remove a trusted device. Removing a trusted device will ensure that it can no longer display verification codes and that access to iCloud, and other Apple services on the device, is blocked until you sign in again with two-factor authentication. If you need to find or erase your device before you remove it from your trusted device list, you can use Find My iPhone.

Source : Apple Support

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