期刊名称：International Journal of Innovative Research in Computer and Communication Engineering
印刷版ISSN：2320-9798
电子版ISSN：2320-9801
出版年度：2016
卷号：4
期号：2
页码：2297
DOI：10.15680/IJIRCCE.2016.0402099
出版社：S&S Publications
摘要：Nowdays several daily activities such as communication, education, E-commerce, Entertainment and tasks are carried out by using the internet. To perform such web activities users have to register regarding the websites. In registering websites, some intruders write malicious programs that waste the website resources by making automatic false enrolments that are called as bots(computer programs).Thesefalse enrolments which occupies the resource of website hence reduces space, performance and efficiency of servers.So, it becomes necessary to differentiate between human users and Web bots (or computer programs) is known as CAPTCHA.CAPTCHA stands for Completely Automated Public Turing Test To Tell Computer And Human Apart.CAPTCHAsare used because of the factthat it is difficult for the computers to extract the text from such a distorted image, whereas it is relatively easy for a human to understand the text hidden behind the distortions.Many CAPTCHAshave been proposed in the literature that text-graphical based, audio-based, puzzle-based and mathematical questions-based. The design and implementation of CAPTCHAsfall in the realm of Artificial Intelligence. We aim to utilize CAPTCHAsas a tool to improve the security of Internet based applications
关键词：Turing test;Worms and Spam;Bots; Mathbased CAPTCHA
