Web single sign-on (Web SSO) authentication services are used to verify a person's identity when they sign into a password-protected website. Once a person signs into the Web SSO system, they can seamlessly access other Web-SSO-protected websites without being prompted for their password again. UC Davis currently offers two Web SSO services: CAS and Shibboleth.
Duo is a multi-factor authentication system that will make it much harder for hackers to access your UC Davis accounts. Even if someone has stolen your passphrase, they will need a “second factor” — in most cases a temporary numeric code, to access your account.