Require Field To Be Empty

[tylan]

I'm looking for a way to make a condition that will require a field to always be empty. I guess you can call it a honey pot. I read an article at sans.org that had a great idea. They suggested some other ways to protect against form SPAM...

"..... one or more fake form fields are added to the form. But style sheets are used to make them "invisible". To further confuse the attacker, the fake form fields are given names like "subject" and such suggesting to the bot that these are the form fields they are looking for. However, whenever a form is submitted with content in a "hidden" field, it is discarded. I am not talking about the classic hidden form fields that are not user changeable, but form fields that are marked with "display: none"........"

How do I make a condition to discard the form if the invisible field contains data?

[tylan]

Here's what I've come up with...

The trap field:
<textarea name="textarea" style="display: none" id="textarea"></textarea>

My requirements / conditions that make this work:
<input name="required" type="hidden" value="realname,email,phone">
<input name="conditions2" type="hidden" id="conditions2" value=":##TEST#email^textarea#Humans can't see the textarea field! You must be a SPAMBOT!#" />

I have no idea if the invisible field trap is even valid these days, but it's just another piece to protect my form from spam. I'd love to hear input on this.

Tylan