Click based Graphical CAPTCHA to thwart spyware attack

Software that gathers information regarding the computer's use secretly and conveys that information to a third party is Spyware. This paper proposes a click based Graphical CAPTCHA to overcome the spyware attacks. In case of traditional Text-Based CAPTCHA's user normally enters disorder strings to form a CAPTCHA, the same is stored in the key loggers where spywares can decode it easily. To overcome this, Click-Based Graphical CAPTCHA uses a unique way of verification where user clicks on a sequence of images to form a CAPTCHA, and that sequence is stored in pixels with a random predefined order. This paper also analyzes the proposed scheme in terms of usability, security and performance.