Duo Two-factor Authentication is the exclusive authentication method that requires every user - faculty, staff, student, and affiliate - to register for and utilize Duo to manage their HSC account. If you have not previously registered for Duo, you will need to either (a) have and use a smartphone (or tablet) with the Duo app installed or (b) would need to purchase a $25 token from the IT Service Desk before attempting to manage your HSC account.