What if you could use a password with 13 characters, letters, numbers, or special characters and use a different combination for every online account you have? What if you could change those passwords every time you login? Pretty secure, right? That’s the idea behind security keys. Small devices that plug into a computer or tap on the back of a phone. They use biometrics to unlock your accounts. And now, they’re going to be able to work on iPhones.