How to use a two-factor security key
Two-factor authentication is a good way to add an extra layer of security to online accounts. It requires the use of your smartphone, however, which is not only inconvenient, but it can be a problem if your phone is lost or breached.
from https://www.theverge.com/2019/2/22/18235288/two-factor-authentication-security-key-how-to
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