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CAPTCHA has been widely used for preventing malicious programs to access web resources automatically. In this paper, a new type CAPTCHA system will be proposed. The proposed scheme, named Click spell, combined the features of text-based and image-based CAPTCHAs. Click spell asks users to spell a randomly chosen word by clicking distorted letters for passing the test. Users can learn the definition(s)...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.