期刊名称：International Journal of Computer Science and Information Technologies
电子版ISSN：0975-9646
出版年度：2014
卷号：5
期号：5
页码：6341-6344
出版社：TechScience Publications
摘要：Captcha (Completely Automated public Turing test to tell Computers and Humans Apart) system is used to verify whether a user is human or computer program. It’s also known as human Interactive Proof (HIP) and based upon Artificial Intelligence. Captcha is a program that protects websites from web-bots by generating tests that computer cannot pass but human can pass .This paper comprise introduction of captcha, various techniques, application of captcha and drawbacks of captcha
关键词：Captcha; Application; Issues and Drawback;of captcha.
