Although it is simply adding another layer to your existing Security by Obscurity (and therefore not the entire solution to your problem), you might at least consider accepting only POST-type requests in your script. That is, instead of accessing the script by this hyperlink URL:

http://www.foo.com/cgi-bin/foo.pl?user=foolish&id=2

you use a form with all hidden fields and a button (which may be a bitmap):

<FORM METHOD=POST>
<INPUT TYPE=HIDDEN NAME='user' VALUE='foolish'>
<INPUT TYPE=HIDDEN NAME='id' VALUE='2'>
<!-- use THIS: -->
<INPUT TYPE=SUBMIT VALUE='Button Title'>
<!-- OR THIS: -->
<INPUT TYPE=IMAGE SRC='/images/button_img.jpg' onClick='submit()'>
</FORM>

[download]

Update: This won't prevent users from seeing what parameters your script takes (and their values), but rejecting GET requests will at least make it harder to fake them.

dmm

If you GIVE a man a fish you feed him for a day
But, TEACH him to fish and you feed him for a lifetime

In reply to Re: Preventing changes on the by dmmiller2k
in thread Preventing changes on the by DaWolf

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