Different Authentication/Security Provider for Each Site Collection

Hi ,

I have a Web Application (WA1 ) and it has 4 Site Collections (SC1 , SC2, SC3 , SC4 ). I want to use Authentication Provider(AP1) for 2 Site Collections(SC1 and SC2) and another authentication provider(AP2) for Site Collection(SC3) and Authentication Provider (AP3) for another Site Collection (SC4).

By default what ever is the security is implemented or defined at the Web Application level is carried forward to all the Site Collections. Now, how can I define different security implementation for each Site Collection. Kindly help.

Thank you,

Prabhu