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JA-SIG produces an enterprise-wide single sign on system known as CAS. Unlike other initiatives, JA-SIG's Central Authentication Service is open source, widely used, simple to understand, platform independent, and supports proxy capabilities. Spring Security fully supports CAS, and provides an easy migration path from single-application deployments of Spring Security through to multiple-application deployments secured by an enterprise-wide CAS server.
You can learn more about CAS at
http://www.ja-sig.org/products/cas/
. You will also need
to visit this site to download the CAS Server files.