Don't forget robust! My Yubikey has survived on my keyring longer than I ever expected. Also, the fact that it requires being plugged (powered) to generate a

Don't forget robust! My Yubikey has survived on my keyring longer than I ever expected. Also, the fact that it requires being plugged (powered) to generate a HOTP token makes it very resistant to my kids who invalidate my work's LCD-with-button keyfob all the time.