At IU, what is CAS?

At Indiana University, Central Authentication Service (CAS) is a login service that allows you to access multiple password-protected web systems after logging in once on a central authentication server; this is often referred to as single sign-on.

CAS currently supports several IU web applications, including Oncourse CL, OneStart, SafeWord card authentication, TimeKeeping, PeopleSoft, HRMS (payroll), and the employee Paid Time Off (PTO) system. In the future, other IU systems will use CAS as well.

You will be automatically redirected to the CAS login screen when you access one of the supported systems, unless you have already authenticated to CAS during your session. You can also reach the CAS login screen directly at:

Note: If your passphrase is over two years old, CAS will remind you to change it. Select Change my passphrase to go to the Passphrase Maintenance page, or No thanks, just finish my login to continue to CAS. This reminder will appear every time you log into CAS, until you change your passphrase.

CAS currently supports three types of authentication: Active Directory, SafeWord, and Guest. CAS clients can be deployed on a combination of platforms including Windows, Linux, and both Apache and IIS. CAS supports a variety of tools and languages including Java, Active Server Pages, and Perl.

At IU, no single sign-on solutions other than CAS are available, although other ways exist to authenticate users directly.

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