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While I'm not sure this is news (well not anymore) I love ReCAPTCHA. What I especially like about ReCAPTCHA is the engineering elegance. The second word is har

by sh1mmer 18y ago

While I'm not sure this is news (well not anymore) I love ReCAPTCHA. What I especially like about ReCAPTCHA is the engineering elegance. The second word is hard to break by hackers because it already failed a machine OCR algorithm (obviously that doesn't solve "Turking"). I also like that they have an audio CAPTCHA making their solution accessible by default. This is something a lot of home grown solutions lack. The Web should remain a place for everyone with or without a visual impairment.

aneesh 18y ago
"The second word is hard to break by hackers because it already failed a machine OCR algorithm" But, from what I understand, the hackers don't have to get that word correct. The system only checks the answer to the known one, right?
- sh1mmer 18y ago
  I think the known ones were previously decoded by humans not machines. I could be wrong. But that would make it a bit crap as you say.
  - aneesh 18y ago
    "The user is then asked to read both words. If they solve the one for which the answer is known, the system assumes their answer is correct for the new one."