3D Socio Graphical CAPTCHA based on reCAPTCHA against spammers and bots

摘要

Website security is a major concern in today's world. CAPTCHA are used to protect websites from spammers, bots and unauthorized users. Different types of CAPTCHA are text CAPTCHA and graphical CAPTCHA. Text CAPTCHA are vulnerable to segmentation attack and graphical CAPTCHA are vulnerable to bot attack. To overcome such attacks we have designed a modern graphical CAPTCHA system by combining the concept of reCAPTCHA and graphical CAPTCHA. Our proposed system contains two images in CAPTCHA challenge and user performs click event to solve the CAPTCHA. In conducted survey, it is proved that system gain high usability, learnability, memorability, accuracy and robustness against bot and spamming attack.