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Actually i'm working on CAS integration (Central Autentication server) for intranet SSO.
After that, I've planned to work on federated identity (because it's the name for the "Multi-Site Registration").
OpenId is in the scope.
With OpenID, Shiboleth, Liberty alliance, and so on there is a lot of API that must be qualified.
Some of solution need a centralized server (identity provider) that needs hosting services behind.
I've tested OpenID and it's very simple to use.
it's a very ambitious project that needs resource and time with security consideration.
Identity management, LDAP, Workflow and more
XoopsPro