I have a small series of web pages that talks to a database and uses
forms to input/alter data.

In order to get to these web pages a user has to authenticate. If
valid, I put a cookie on their machine that expires in 10 minutes. So
basically, they can use the forms for up to 10 minutes, from which
time they have to log back into the system.

My problem is that when the user exists the web page, they can still
hit the back button and see all the data they entered. This is a
security issue since someone could basically sit down at the same
computer and hit back to find out some vital information, assuming the
original user doesn't exit the browser.

I'm trying to setup something that prevents the client from just going
back into the secured area by hitting back. I notice that on systems
such as Wells Fargo's online banking, once you logoff, you cannot hit
back to get back to your account. This is exactly what I'm trying to
do, yet I have been unable to find out how to accomplish this.

I already have all the no-cache meta options in my HTML. What would be
perfect would be if there were a perl/CGI function that could detect
if the user is going back to the .cgi file via the back button and
then act how you choose. However, I feel there should be an even
easier way about this.

Any ideas?


Thank you,
Sean Abrahams
SFSU : Fiscal Affairs Business Systems
[EMAIL PROTECTED]


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