Is there a way to keep a page from rendering once a person has logged out but hit the “back” button?

Question

I have some website which requires a logon and shows sensitive information.

The person goes to the page, is prompted to log in, then gets to see the information.

Answer 1

It's a bit of a strain, but if you had a java applet or a flash application that was embedded and authentication was done through that you could make it so that they had to authenticate in, erm, 'real-time' with the server everytime they wanted to view the information.

Using this you could also encrypt any information.

There's always the possibility that someone can just save the page with the sensitive information on, having no cache isn't going to get around this situation (but then a screenshot can always be taken of a flash or java application).