Not 100% secure, but you could encrypt the value...
> How do I encode URL variables so that I can pass semi-sensitive info over
URL?
>
<!--- duh.cfm --->
<cfset thestring = "A new value?">
<cfset thekey = "test">
<cfoutput>
<form action="duh2.cfm" method="get">
<input type="hidden" name="test10"
value="#URLEncodedFormat(Encrypt(thestring, thekey))#">
<input type="submit" value="Test">
</form>
</cfoutput>
<!---Duh2.cfm--->
<cfset thekey = "test">
<cfset decodedvalue = decrypt(URLDecode(test10), thekey)>
<cfoutput>
#decodedvalue#
</cfoutput>
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