As a matter of security, all SiteFarm sites require the use of a Kerberos ID and password, along with multi-factor authentication via Duo once the site has gone live and been successfully enrolled with the CAS Service Registry as part of the site launch checklist. The login process is controlled by the CAS module installed on all SiteFarm sites, which "talks" to other campus systems to verify and authenticate the validity of a user account during login.