期刊名称：International Journal of Computer Science and Information Technologies
电子版ISSN：0975-9646
出版年度：2015
卷号：6
期号：3
页码：2800-2805
出版社：TechScience Publications
摘要：CAPTCHA stands for Completely Automated Public Turing test to tell Computer and Humans Apart. CAPTCHAs are used to improve the security of Internet based applications in order to ensure that a web based application which is intended to be used by a human being is not maliciously used by Artificially Intelligent programs called bots. Bot is a simple computer program used to perform highly repetitive operations. Anti- CAPTCHA technology is advancing, and so are attempts made to build a better CAPTCHA or its equivalent. As the current CAPTCHA methods are striving to be more difficult for bots, they are gradually becoming difficult and annoying for human users as well, and this is the main drawback of CAPTCHA. The applications that use CAPTCHA need to be aware and up to date about reliability of the CAPTCHA they are using. A CAPTCHA system is considered to be broken if an automated attacker reaches a precision of 1%, as it fails the main purpose. To ensure security of the web based applications, users have to prove if they are human or not.
