DefinePK

Abstract

Tremendous scope in the field of designing and cracking CAPTCHAs (an acronym and stands for “Completely Automated Public Turning Test to tell Computers and Humans Apart”) are in demand now-a-days. In the applicability part of designing and cracking, new gateways for computing research are obtained. Designing better CAPTCHA mean better security for systems in means of withstanding against odds and the breaking of current existing system refers to the advancement of artificial intelligence (AI) which is done by exploring the loopholes in system. CAPTCHA is basically used as a protection from malicious programs like Bots and evading deliberate attempts of accession by parties other than humans. For web security, we are using different type of CAPTCHA depending upon the parameters and approaches used for generation of particular primitive. In this paper, need, aspects like, design, strength, weakness and results obtained by various researchers in this field are explored. This will also help various researchers to carryout research in this direction.