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The following article describes conceptually how the Viewpoint Security Model is structured.

Viewpoint provides an enhanced security architecture, known as VISA (Viewpoint Information Security Architecture), that allows an individual portlet to specify its own security domain model and still plug-in to the overall security system to take advantage of common services. The key features of VISA include:

The VISA policy/authorization/verdict engine may initially seem a a little daunting, but it's really quite simple.

Before a security policy decision can be made, VISA must know the identity of the user attempting the action in question. Identity is established through a process of authentication: typically using a username and password.

Configuration of two XML files in your portlet's WEB-INF folder is required to integrate your portlet with VISA. The first file is the familiar web.xml where listener and filter classes are configured.