Fully Accessible Spam-Form-Submission Blocking Using ColdFusion And (X)HTML (Version III)

code-1.cfm

<!--- Get the de-spamming key. --->
<cfset REQUEST.TestKey = (
	"KS" &
	Encrypt(
		RandRange( -30, 30 ),
		"SECRET_KEY_GOES_HERE",
		"CFMX_COMPAT",
		"HEX"
		)
	) />

code-2.cfm

<form>
	<input type="hidden" name="test_key" value="#REQUEST.TestKey#" />
	<input type="hidden" name="test_email" value=" #REQUEST.TestKey# " />

	<!---
		REST OF THE FORM GOES [[ HERE ]].
		THIS IS THE FORM THAT THE USER ACTUALLY SEES.
	--->


	<!--- THIS IS AFTER THE VISIBLE FORM FIELDS. --->

	<div style="display: none ; visibility: hidden ;">

		<p>
			NOTE: Do Not Alter These Fields:
		</p>

		<label>
			Contact Email:
			<input
				type="text"
				name="contact_email"
				value="<cfif StructKeyExists( FORM, "contact_email" )>#FORM.contact_email#</cfif>"
				/>
		</label>

		<label>
			Contact Email:
			<input
				type="text"
				name="contact_email2"
				value=" #REQUEST.TestKey# "
				/>
		</label>

		<label>
			Contact Url:
			<input
				type="text"
				name="contact_url"
				value="<cfif StructKeyExists( FORM, "contact_url" )>#FORM.contact_url#</cfif>"
				/>
		</label>

		<label>
			Subscribe to Blog:
			<input
				type="checkbox"
				name="contact_subscribe"
				value="1"
				<cfif StructKeyExists( FORM, "contact_subscribe" )>checked="true"</cfif>
				/>
		</label>

		<label>
			Remember my Info:
			<input
				type="checkbox"
				name="contact_remember_info"
				value="1"
				<cfif StructKeyExists( FORM, "contact_remember_info" )>checked="true"</cfif>
				/>
		</label>

	</div>

</form>

code-3.cfm

<!--- The following is all for de-spamming. --->
<cfif (
	Compare( FORM.test_key, FORM.test_email ) OR

	(NOT StructKeyExists( FORM, "contact_email" )) OR

	Len( FORM.contact_email ) OR

	(NOT StructKeyExists( FORM, "contact_email2" )) OR

	Compare( FORM.contact_email2, FORM.test_email ) OR

	(NOT StructKeyExists( FORM, "contact_url" )) OR

	Len( FORM.contact_url ) OR

	StructKeyExists( FORM, "contact_subscribe" ) OR

	StructKeyExists( FORM, "contact_remember_info" )
	)>

	<!--- Set error message. --->
	<cfset REQUEST.FormErrors.Add(
		"There was a problem submitting the form"
		) />

</cfif>