[edit] What is It

When accessing a web site or service on the internet, before you are given access to it, the web server must first validate that you are who you say you are. This is called authentication. Single Sign-On is a central service that confirms your identity when you attempt to access content that requires authentication. The idea is that a user first logs into the Single Sign-On service and all other services, such as WebMail, calendaring, etc ask the Single Sign-On service instead of you for your identity. The end result is that you enter your password once and are automatically logged in to any service that would normally require you to enter your password.

[edit] Case's Implementation

The Case SSO implementations live at https://login.case.edu. The current main implementation is using CAS.

Previously, Case used Pubcookie as its SSO service. However, this service was difficult to adopt and CAS was swapped in during August 2005.