OK, so captchas (I suppose I should capitalize that, but too… darned… lazy) exist to detect that you’re a real human and not some script that’s up to no good.
But… What if you’re a human who’s being used by script that’s up to no good?
Via Seth: someone’s come up with an app that makes you enter captcha information to see a strip tease, but rather than generate the captchas itself, the program just grabs them from a convenient place, like Yahoo Mail, and then it uses your answers to gain entry into the captcha-protected site.
It’s one of those things that you’re amazed nobody’s thought of sooner.
Coincidentally, I was trying to implement a captcha on a form the other day. Rather than reinvent the wheel, I went with CMU’s reCAPTCHA project, which also uses your input, but in this case it’s to help digitize books.
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