Six Bengali CAPTCHA variants achieve 0-20% average OCR character recognition on 6000 challenges and 56-90% human success rates with 6.7-9.9 second response times in tests with 110 participants.
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A Usable and Secure Bengali CAPTCHA
Six Bengali CAPTCHA variants achieve 0-20% average OCR character recognition on 6000 challenges and 56-90% human success rates with 6.7-9.9 second response times in tests with 110 participants.