Honeypots: Invisible CAPTCHAs fool the WaspBots
This is an interesting idea proposed by Haacked last month. It’s based on the premise that spam bots don’t render CSSs, and that whenever they spot a form field, they go nuts and start filling it up. The invisible captcha uses the style sheet to hide the field from the user, but it still exists from the bot’s view. You then set a rule that an action is only valid if this field is left blank.
The beauty is that users are not burdenned with deciphering psycho-scripts, and resolves some accessibility concerns. Make sure you don’t label the field “honeypot”, and that you provide audio instructions to leave the field blank for audio readers that might trip up on the field.
WaspBot via Fotolia
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