BibTeX:

@article{IJIRSTV2I6009,
     title={CAPTCHA As Graphical Password Authentication System With IP Blacklisting},
     author={SYEATHA MERLIN THAMPY and ALPHONSA JOHNY},
     journal={International Journal for Innovative Research in Science & Technology},
     volume={2},
     number={6},
     pages={17--23},
     year={},
     url={http://www.ijirst.org/articles/IJIRSTV2I6009.pdf},
     publisher={IJIRST (International Journal for Innovative Research in Science & Technology)},
}

Nowadays, authentication is one of the important fields in information security. Strong text-based password could provide certain degree of security level. However, the fact that, those strong passwords are difficult to memorize by the users. Graphical authentication has been proposed as an alternative solution to text-based authentication. Many researches shows that humans can remember images better than text. In recent years, many networks, computer systems and Internet based environments used graphical authentication technique for authentication. But this graphical authentication technique has many limitations. CAPTCHA is a programme that protects website against bots by generating and grading tests that human can pass but current computer program cannot. This paper present a new technology called Captcha as gRaphicalPassword (CaRP). CaRP combines both CAPTCHA and graphical password scheme. CaRP offers protection against dictionary attacks, relay attacks, shoulder surfing attacks. With the rapid development of internet, the number of people who are online also increases tremendously. The misuse and abuse of internet is growing at an alarming rate. Restriction of access is performed by introducing the concept of blacklisting of IP address.

Graphical password, brute force attack, dictionary attacks, security, image passwords