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AFAIK, .NET 4.5+ support claims-based authentication but not the lower versions, e.g. .NET 4 apps. Is there any way to apply claims-based authentication to my applications (as Relying Parties) without upgrading them to .NET 4.5 to have the benefits of SSO?

Lewis LE
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Before .NET 4.5 - WIF (Windows Identity Foundation) was used as an add-on library to add claims, ws-federation etc. It is on the wire compatible with .NET 4.5.

http://www.microsoft.com/en-us/download/details.aspx?id=17331

leastprivilege
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    Thank you Dom! I will google more for the detailed implementation. By the way, I really appreciate your contribution to the community regarding claims-based identity. Your book and courses on Pluralsight are super helpful. Again, thank you! – Lewis LE Apr 28 '14 at 10:36