Security issue!

[eluser]pieter dekker[/eluser]
[quote author="mrahman" date="1194927377"]user interfaces generally (like views) should not contain sensitive data or just be displayed without further authentication checks. you have to checkLogin() in each snippet in your view that displays confidential stuff in case of a successful login. so your code above will be useful just for preventing permissions errors to be displayed and to be a user friendly mechanism, not to grant or deny.[/quote]

It's easy to understand that views shouldn't contain sensitive data. But how do you display sensitive data? Do I need to call from the view to a controller function?
How do you display sensitive data?

Tnx for all the reactions so far!