Abstract
Today a number of everyday activities are done through the Internet. To perform such web services users must register in relation to websites or fill some form. In such websites, some hackers write malicious programs called bots that destroy website resources by creating fake registrations or form submissions. This false registration may adversely affect the performance of websites. Therefore, it is necessary to distinguish between actual human users and Web bots (or computer programs) via tests known as CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart). Most of the conventional CAPTCHA challenges have become an easy nut to crack for bots, hence calling a need for better CAPTCHA alternatives. This paper studies the infamous 'Sliding Puzzle' as an alternate CAPTCHA challenge and analysing the complexity to solve it via bot script.
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