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Designing an unbeatable CAPTCHA

The CAPTCHA has been around for years, but most designs are still not perfect. In fact most can be defeated with some simple image manipulation and a decent OCR algorithm. For those of you that don’t know, a CAPTCHA is an challenge-response system in which the user is presented with a problem that they must solve in order to verify that they are human and not a spam-bot. There are many popular designs around (reCAPTCHA, Egglue, etc) but the important question is which is the best?

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