A Basic Survey of CAPTCHA :Application and Challenges
Keywords:
CAPTCHA, Types of CAPTCHA, Applications of CAPTCHA, Challenge of CAPTCHAAbstract
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.
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