i have a url like the attached. After the php/mysql application is run, a confirmation page is shown and an email is sent to the client both have the url included. I need to encrypt this url. i don't know how to do this from within the application. some have suggested setting a random number generator, attaching that to the ID number. I think i just need to encrypt teh ID_NUMBER which is 202 in this case. How do i do that without disrupting the rest of the application? Where do I start?