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Stop form spam - When CAPTCHA is not enough

Filed in archive Anti-Spam Tools by Ivy on November 09, 2006

Stop form spam - When CAPTCHA is not enough
We all have this problem, don't we? CAPTCHAs are simply not enough anymore to stop spammers from seeding your comment fields and various contact forms. Only last week we suffered a spam flood, leaving us with a sour taste in our mouths and searching for the ultimate answer.

Luckily, Internet Storm Center and its Johannes Ullrich also had similar problems, and that lot solved the problem by employing the use of invisible form fields:
"one or more fake form fields are added to the form. But style sheets are used to make them "invisible". To further confuse the attackerlinks, the fake form fields are given names like "subject" and such suggesting to the bot that these are the form fields they are looking for. However, whenever a form is submitted with content in a "hidden" field, it is discarded. I am not talking about the classic hidden form fields that are not user changeable, but form fields that are marked with "display: none"

Smart isn't it?

Internet Storm Center cut its response form spam to a bare minimum, so I think this would be a great solution for many blogs, websites and online shops.


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Permalink: Stop form spam - When CAPTCHA is not enough
Tags: spam+fight  anti+spam  captcha  form+spam  comment+spam  response+spam 

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