Introducing YubiKey USB hardware tokens
PingID enables you to use your YubiKey hardware stick to access your accounts and applications with the added security of multifactor authentication.
Before you can start using your YubiKey to authenticate, you'll need to pair it with your account. Pairing creates a trust between the YubiKey and your account, so you can use the YubiKey to authenticate during the login process. Visit here
for instructions on how to do so.