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The following links provide more information about CAS:
http://www.ja-sigjasig.org/products/cas/overview/cas2_-architecture/index.html - Provides an overview of the CAS 2 Architecure, upon which CAS 3 is based.
http://www.ja-sigjasig.org/products/cas/overview/protocol/index.html - The CAS Protocol Specification
httphttps://wwwwiki.ja-sigjasig.org/productsdisplay/cas/overview/proxy_auth/index.htmlCAS/Proxy+CAS+Walkthrough - A description of the CAS Proxy Authentication scheme