CAS History

CAS (Central Authentication Server) Protocol History

CAS is a simple central authentication server protocol. It was initially conceived and developed by Shawn Bayern of Yale University Technology and Planning. It was later maintained by Drew Mazurek at Yale. CAS 1.0 implemented single-sign-on. CAS 2.0 introduced multi-tier proxy authentication. Several other CAS distributions have been developed with new features.

In December 2004, CAS became a project of the Java in Administration Special Interest Group (JASIG), which is as of 2008 responsible for its maintenance and development. Formerly called “Yale CAS”, CAS is now also known as “Jasig CAS”. In 2010, Jasig entered into talks with the Sakai Foundation to merge the two organizations. The two organizations were consolidated as Apereo Foundation in December 2012.

At the time of December 2006, CAS was in use at “hundreds of university campuses (among other beneficiaries)”.

CAS Protocol Version History

  • v1.0: May 4, 2005. The initial release of protocol.
  • v2.0: April, 2013. Introduce proxy authentication support.
  • v3.0.2: January 3, 2015. The latest release of protocol.


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