A Basic Survey of CAPTCHA :Application and Challenges

Archana Bhalerao¹ , Lina Rade²

Section:Review Paper, Product Type: Journal Paper
Vol.06 , Special Issue.01 , pp.1-5, Jan-2018

Online published on Jan 31, 2018

Copyright © Archana Bhalerao, Lina Rade . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.  

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Abstract :
There are many services in the internet including Email, search engine,social networking are provided with free of cost. To access these web services users have to register regarding the websites. During registration, some intruders or attackers write malicious programs that waste the website resources by making automatic false enrolments which are called as bots. Security researchers developed many techniques to prevent from accessing web resources by these bots. CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a human authentication technique that generates tests to differentiate between human user and a malicious computer program. CAPTCHA techniques tries to maximize the difficulty for automated programs to pass tests .We can see many CAPTCHAs in web site with their own approach to provide security. In this article we take an overview of different and recently proposed CAPTCHA techniques. It proposes an approach to generate a robust CAPTCHA. The CAPTCHA is generated in two steps fist by randomizing alphanumeric characters and finally different queries are attached with it. The generated CAPTCHA is simple and can improve the usability and security with reduced solving time of human.

Key-Words / Index Term :
CAPTCHA,Types of CAPTCHA, Applications of CAPTCHA, Challenge of CAPTCHA

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