Silverlight 3 security and Authentication mechanism

I am creating a Silverlight 3 application for which i am designing the security block. I already have an existent ASP.N开发者_C百科ET authentication module that i will reuse in the WCF security service(which will be like a wrapper and this will be called from Silverlight). My goal is to use SSL for the transport security. Also i would want this to be scalable as i don't want to query the DBMS for each authentication service call.

Any pointers on best design approaches.

Thank you. Anjan

If you already have it done in ASP.Net then you might want to take a look at .NET RIA Services. RIA Services allows you to hook into the ASP.Net authentication right inside of Silverlight. Brada has written about this and has a post on RIA Services Authentication here.