Tuesday, 8 March 2005
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Comment spam
posted at
10:18 PM
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Apparently CAPTCHA is not foolproof -- Casey Chestnut did a proof-of-concept for defeating CAPTCHA and and blogged about it, but his site is unreachable right now. (A person with a paranoid mindset might conclude that Casey's controversial post has something to do with the unavailability of his site.) But anyway, few comment spammers probably want to go to that much trouble when there are so many other, easier targets. At least, I think.
This blog entry from David Weinberger has an interesting comment thread where people suggest various alternatives. An approach that seems interesting is to pose a question that would be easy for humans to answer ("What is 1 + 3?", perhaps using randomly selected digits), but which a machine could not guess from scraping the comment-entry page. Maybe I'll play with that in my "spare" time.
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