International Journal of Computer Science and Management Research (IJCSMR)
CAPTCHA is Completely Automated Public Turing test to tell Computers and Humans Apart. It's become a key to prevent malicious programs to access web resources automatically. In this paper, a new type CAPTCHA system will be proposed. The proposed scheme, named Clickspell, combined the features of text-based and image-based CAPTCHAs. Clickspell asks users to spell a randomly chosen word by clicking distorted letters for passing the test. Users can learn the definition(s) of the chosen word. Clickspell can add an advertisement image which in turn increases Security of the users system.