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IWA is an example of Browser Based Authentication since it is a feature that must be built-in to the browser. As with Forms/SSL, the user must trust the web site they are sending their credentials to. Since http://glast-ground.slac.stanford.edu/ is an official GLAST web site that has been vetted by SLAC Computing Services (SCS), GLAST users can trust that it is safe and secure to provide their SLAC credentials to the web site. In the dialog boxes above, the visual cue that it is safe for the user to enter their username and password into the dialog box is the HTTP address in the dialog box. it It is clear to the user that they are connecting to the web site http://glast-ground.slac.stanford.edu/, and since they trust this web site they can safely enter their username and password.
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