Quote:
Originally Posted by Mike L
Which means that a savvy user would only need to type in the "known" word -- presumably the more obvious of the two - and type any old keystrokes for the other, and they would pass the test.
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That is correct. The first purpose of captcha is to defeat automated spambots that are trying to spam a blog/forum/etc. site. If you can correctly identify an obscured word then you are probably not a spambot. So for this purpose only one word is needed.
The 'secondary' use is to decipher words that the OCR software has low certainty on. In this case it assumes the correct answer is the mode of the persons answers. You could put anything in if you are an anarchist and feel like spreading chaos, I guess. But why?