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A comment on Using WolframAlpha to Hack Text CAPTCHA.

Re:Using WolframAlpha to Hack Text CAPTCHA by gojomo on Wednesday November 10, 2010 @03:24PM (#1891680)
Some ALMOSTs could be turned into SUCCESSes with a few postprocessing rules-of-thumb, like:

- the CAPTCHA usually wants a single word or number

- the desired word is usually the rarer or later one

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Re:Using WolframAlpha to Hack Text CAPTCHA by joelvh on Wednesday November 10, 2010 @03:28PM (#1891691)
Exactly. The whole discussion here points to the major flaws in using text as CAPTCHA. Maybe if questions were more metaphorical they would be harder to guess, but then there is no absolute answer. I think a combination of text, image, and logic would be hardest to break.
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Re:Using WolframAlpha to Hack Text CAPTCHA by elliottcarlson on Wednesday November 10, 2010 @03:28PM (#1891688)
It's still a game of guesswork. Generally if you fail the CAPTCHA you will be offered a new one; and any good system should lock you out after a certain amount of failures.
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Re:Using WolframAlpha to Hack Text CAPTCHA by jerf on Wednesday November 10, 2010 @08:50PM (#1892541)
Assume spammers are using botnets. The problem of locking them out is as hard as detecting them in the first place.
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