![]() ![]() The designs are made segment proof with overlapping random shapes, overlapping characters, clasping, different colors and different shades. Out of 16 reviewed CAPTCHAs, 12 are based on English language, 1 on Arabic language, 1 on Chinese language, 1 on Devanagari language and 1 on Gurumukhi script. The security and usability measures are not calculated/sustained using some known English schemes. In this paper, 16 text-based CAPTCHA's generation methods are discussed with usability and security ranges from 3 to 100 and 65 to 100%, respectively. It is a systematic and complete analysis of all available CAPTCHA types. The main aim of this article is to present a literature to identify and recognize CAPTCHA, its types, the creation and breaking techniques. In this paper, all these types are collaborating at single place to analyze. A few CAPTCHA schemes are available today like, text-based, audio-based, video/animation-based, puzzle based etc. ![]() CAPTCHA stands for Completely Automated Public Turing Test to Tell Computers and Human Apart. ![]()
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