Analogue Clock Captcha: A Secured Approach against OCR Attacks

Abstract

Captcha is an automated test to determine the user on a website is either human being or computer bots. The Captcha test classically requests the user to perform various assignments which is straightforward for humans to complete whereas not easy for bots to complete. Thus Captcha act as a security arrangement to prevent bots, in getting hold of access to the sensitive information of web sites and abuse their online services. Bots emulate the behavior of humans and carry out malicious actions such as gather e-mail addresses to spam. The popular text based Captcha are uncomplicated and easy to use, but it suffers from OCR attacks. Image based Captcha are visually attractive and more immune to attacks. The proposed Analogue Clock Captcha is a arrangement of image and text based Captcha methods. It enjoys the merits of both the methods and overcome the drawback in the individual methods. It is very insusceptible to any type of OCR attacks and a user friendly approach. Analogue Clock Captcha is a novel method which provides enhanced security for the web applications.