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Multi-Factor Authentication (or MFA) requires you to use more than one method to prove your identity such as “something you know” and “something you have”. An example would be entering , when accessing a web resource and having to enter your username and password (method 1something you know) and approving a Duo authentication request on your phone (method 2).
Duo Help Docs
DUO: Initial Phone Enrollment something you have).
Recommended MFA Authentication Options
The following are recommended MFA authentication options.
Verified Duo Push
Hardware Token
The following are considered insecure MFA authentication options and should be avoided in favor of the options listed above.
Phone Call
SMS / Text Message
Duo Help Docs
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