At IU, what is CAS?
IU students, faculty, and staff authenticate through CAS using their IU usernames and passphrases. Individuals who are not officially affiliated with IU can use their IU Guest account or IU Extranet account credentials to authenticate through CAS for access to a limited number of IU services.
CAS currently supports several IU web applications, including One.IU, Duo two-step login, 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:
CAS currently supports three types of authentication: Active Directory, Duo, 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.
While CAS authentication will only return a username, you can use that username to query ADS and retrieve more information. See At IU, how can I query ADS using LDAP?
To stay informed or provide feedback about Indiana University's Central Authentication Service (CAS), or to ask questions about developing with IU CAS, use the
cas-discuss-l mailing list. To subscribe, send email to
This is document akui in the Knowledge Base.
Last modified on 2016-08-25 14:41:05.
- Fill out this form to submit your issue to the UITS Support Center.
- Please note that you must be affiliated with Indiana University to receive support.
- All fields are required.