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[quote]First, great article!I tltaloy agree with you that having a method that uses the human behaviour that compares it to a bot behaviour is certainly a way to decrease the amount of SPAM you will receive.That said, I am not sure that your method, using only Javascript, can be efficient in the long term. If your method is used only on your site, it can surely work. But if everybody use it, spammer will grab your source, interprete it and submit the right token when submitting the form.Depending on how your caching works (usually, you still run some PHP code to get the cached file), you could add a value in the user's session containing your last_request' date) and then compare it when the form is submitted. As this logic would be implemented server-side, it could not be manipulated by a bot. You could also detect how many time there is between requests made to your website and tag the session as bot' and not allow comments to this kind of users. By the way, if you can't set a session to a user (because he does not accept or resend cookies), you could also ignore the comment!Using both client side and server side method would increase your chances to get to zero-spam![/quote]
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