Page Comparison

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1. The authentication JSP and authentication service class retrieve the claimed identity of the person performing the authentication, instantiate a class implementing the "Principal" interface, acquire the claimed user's credentials and use them to instantiate a class implementing the "OpaqueCredentials" interface.
2. A class implementing the interface "SecurityContext" will be instantiated and a method with the signature:

   Code Block
   title SecurityContext
   void authenticate(Principal, OpaqueCredentials);

   is executed.
3. A method with the signature:
   boolean isAuthenticated();
   is executed and if the result is "true", then the layout object and the individual channels for the portal session are instantiated. The choice of security provider is derived from a properties file. Secondary security contexts may be registered in a chain off the initial "SecurityContext" object.
4. The parent SecurityContext channel iterates through the chained security context objects and call the authenticate() method of each.

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