Collaborated with Steve Nelson from http://www.fusebox.org/ to come up with a version specific to the fusebox methodlogy. Take a look at formurl2attributes_encrypt in the download page. (starting with version 2.3)
cfURLencrypt: An Open Source Project
Initial Developers: Kevin Bridges (cyberswat@orlandoartistry.com)
Version: 2.0
Revision Date: 09/14/2001
Website: http://sourceforge.net/projects/cfurlencrypt/
License: GNU Public License
This version as far as I can tell is totally url hack proof. Any alteration of
the URL results in a redirection to an error page. You can also specify which
scope you would like to have the variables converted to by adjusting the attributes
in the decryption calls located in the index.cfm file.... read more
The code has finally posted for the initial release of cfurlencrypt. There is a test links application included in the download that will illustrate the use of the encryption and decryption algorithms. This first release is a sloppy, uncommented version to get things going. The next release will be a fully commented, cleaned up version.