Prove You are HUMAN, Type “CAPTCHA”—A New Security Solution for Web

Abstract

CAPTCHA” stands for Completely Automated Public Turing Test. Due to exponential growth of internet, several free internet resources, such as emails, blogs, polls, and many others are targeted for exploitation by automated processes. Hence, security of web application has become a vital issue and many web applications facing a threat of web bots also known as internet Robot. It is an automated script which executes over the web forms and occupy web spaces and thus increases network traffic. In order to differentiate these automated bots, processes and humans, it has become a standard security practice to implement a strong, secure, human understandable and hassle-free CAPTCHA. CAPTCHA is a challenge-response test that is designed to make sure the user taking the test is actually a human. The idea behind CAPTCHA is based on the assumption that humans are better character recognizer than machines. The CAPTCHA is generated in two steps fist by randomizing alphanumeric characters and finally different queries are attached with it. The generated CAPTCHA is simple and can improve the usability and security with reduced solving time of human. With the worldwide proliferation of spam and bots (especially among social networks and forums), the purpose of CAPTCHA has become very important now a days, it has become a way to verify that the user on the website are humans not robots. For nowadays it has become an intuitive technology for cleaning the traffics on internet.