What is Two Factor Authentication?
Multi-factor authentication (also Two-factor authentication, TFA, T-FA or 2FA) is an approach to authentication which requires the presentation of two or more of the three authentication factors: a knowledge factor (“something the user knows”), a possession factor (“something the user has”), and an inherence factor (“something the user is”). Source: Wikipedia
Why Should I use it?
Using TFA is a great way to add another layer of security or defense to anything that requires a username and password. Even if someone gets a hold of you password they need the other piece of information (fob, key, etc.) in order to log in.
What Can You Use it On?
Anything that let’s you use it. Unfortunately, some websites/applications let you use it and some don’t. I personally use it on a few things like WordPress, Gmail, Gmail for Business, and some others. For these examples Google Authenticator (Google 2 Step Authentication) is the TFA of choice.
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Update! – 4/18 – But Wait, There’s More!
If you use Microsoft Outlook.com for your email, you too can get TFA! Check it out! Microsoft Gets Two-Factor Authentication, You Should Enable It Now