It is possible to use a YubiKey to complete a Duo 2FA. The less expensive "Security Keys" lack OTP features, which will limit the options for using the key. The choice of which key is best suited is left as an exercise for the reader, but we recommend the "5" series keys. T his document explains how to use one of those options, YubiKeys, instead of a smartphone, to accomplish Duo authentication. For those without smartphones, or who wish to limit the use of their smartphone, other options exist. Most users interact with Duo by way of the Duo Mobile application on a smartphone. Since 2016, Princeton has been using Duo for 2-factor authentication (2FA).
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