In this article we’ll discuss the differences between implementations of two-factor authentication in popular mobile platforms. We’ll research how two-factor authentication is implemented in Android, iOS and Windows 10 Mobile, and discuss usability and security implications of each implementation.
What Is Two-Factor Authentication?
Two-factor authentication is an additional security layer protecting access to user accounts in addition to their username and password. In two-factor authentication an extra verification step is required that is separate from the password. Ideally, two-factor authentication schemes would be based on verifying “something you have” in addition to “something you know”. In practical terms this is not always convenient for the end user, so very few straightforward implementations exist (mostly in the banking industry in Europe).
Using the extra verification step based on a piece of information that only the user knows or has access to makes it significantly harder for potential intruders to break in.