Posted by Jason Barnett on 05/27/05 19:36

Dan Rossi wrote:
> Hi there I am mocking up a quick voting poll system, however I would
> like to put hooks in place to prevent users posting more than once,
> voting bots etc. Is there a way to prevent them, obviously sessions,
> cookies, host ips cant be used as they can be removed, and especially
> with host ips , ppl are usually behind a proxy ip that doesnt forwarding
> the referring ip. Let me know if anyone has cooked up something like
> this thanks. I have the voting mechanism and result displaying fine,
> just the special checks to prevent the form being displayed.

If vote bots are your concern, then you will want to use one of those
image generating scripts that create a unique code that only a human can
read. It's tough to identify unique users with anything short of
testing their clock skew.

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