CAPTCHA Based Web Security: An Overview
نویسنده
چکیده
Completely Automatic Public Turing test to tell Computers and Humans Apart (CAPTCHA) is a HIP (Human interactive Proof) system. 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. As the current CAPTCHA methods are striving to turn out to be difficult for bots, they are gradually becoming difficult and annoying for human users as well. In this paper, we review the existing CAPTCHA schemes and the trend of using AI-Complete problems for designing efficient CAPTCHAs. Keywords— Completely Automatic Public Turing test to tell Computers and Humans Apart (CAPTCHA), Human Interactive Proof (HIP), Turing Test, Web Security, AI-Complete
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