Apple has rolled out two-step verification for Apple IDs. Two-step verification makes it more difficult for someone to compromise your Apple ID by adding an additional layer of security. In this case, it’s an iOS device you own such as your iPhone (iPads and iPod touches also apply). As you make a purchase from iTunes on a new device or after you log into your account with your username and password, you’ll be asked to authenticate with a short four-digit code. Currently, two-step verification is available for Apple customers living in the United States, the United Kingdom, Australia, Ireland, and New Zealand.
Using two-step verification is completely optional — you’re not required to use the extra security measure if you don’t want to. For those who opt-in, Apple gives fair warning that you’ll need your trusted device with you to access your account information. Apple does provide a printable Recovery Key in case you lose your iOS device or forget your password, but they won’t be able to help you if you lose it. I recommend storing the Recovery Key in1Password for safe keeping. If you do lose the Recovery Key, you can generate and print a new key if you can log into your account.
I almost forgot! To get started with apple two-factor authentication:
1. Visit appleid.apple.com
2. Select "Password and Security" and enter in the answers to your security questions.
3. Under "Two-Step Verification," select "Get Started" and follow the instructions on screen.