CAPTCHA

Abstract

As currently many people use the Internet to access websites, Internet security becomes an important topic. One popular security mechanism is Captcha or Completely Automated Public Turing Computer and Humans Apart, which determine whether or not the user is human. Nowadays there exist many forms of Captcha with different testing mechanisms. In this study, the researcher would like to determine a form of Captcha that improves user experience on websites. Captcha is divided into 5 types in this study: Invisible Captcha, reCaptcha by Google, Text-based Captcha, Game-based Captcha and Math Captcha, which were tested on 40 people aged 25-34 years as according to surveys people in this age group were the largest group of Internet users. After passing all 5 Captcha tests, the researcher was able to conclude that reCaptcha by Google was the fastest to pass (3.09 seconds), while Captcha that granted the best user experience was Math Captcha because of its entertainment and intuitiveness. Another interesting issue is Invisible Captcha, although being convenient, was not trusted by the majority of the sample users due to its perceived insecurity. Conversely, reCaptcha by Google was deemed the safest.