Dec 28, 2015

How does two-factor authentication work?

I regularly read that two-factor authentication is an important security measure. How does two-factor authentication work, and how does it improve security?
Two Factor Authentication is a secondary level of security. Instead of only asking for your username and password at login you are required to provide an additional piece of information. This could be an answer to a security question that only you should know, or a token such as a pin that's sent to a device in your possession (such as an SMS sent to your phone). This additional level makes it harder for someone other then you to gain access to your account.
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