White List Proxy ?

["McCarty, Eric C." <emccarty () er ucsd edu>]

After considering possible defenses to the multitude of web attacks that continue to surface, I keep coming to the 
conclusion that white lists are the way to go. Unfortunately as we all know, white lists are difficult to maintain and 
often overly restrictive.
 
What I imagined is a type of white list proxy which examines website content before feeding it to the user, it 
determines if there is any malicious code in the page, if there is it will deny the page to the user, if not it will 
provide it to the user and add the site to the white list for 24 hours. 
 
This technique would be similar to how antivirus works in scanning files before allowing open/run actions. 
 
Does anyone know of software that currently does this or something similar? Thoughts ?
 
Eric McCarty

-------------------------------------------------------------------------
Sponsored by: Watchfire

The Twelve Most Common Application-level Hack Attacks
Hackers continue to add billions to the cost of doing business online
despite security executives' efforts to prevent malicious attacks. This
whitepaper identifies the most common methods of attacks that we have seen,
and outlines a guideline for developing secure web applications.
Download today!

https://www.watchfire.com/securearea/whitepapers.aspx?id=701500000008fHe
--------------------------------------------------------------------------