An Overview of the Application of Captcha In Mitigating Ddos Attack on Web Server

Abstract

In IT world today, Mitigation of DDOS attack on web servers and internet has been a major challenge for two decades or more. Introducing CAPTCHA application has proven a strong measure to secure web servers and internet activities. This paper reviews the application of CAPTCHA in mitigating DDOS attack on web servers. A detailed look at the various types of CAPTCHA, its working mechanism, and tuning test was also presented. The various drawbacks of CAPTHA was also presented with a clear road map for future areas of research to improve CAPTCHA technology.