Online Examination System is a software solution, which allows any industry or institute to arrange, conduct and manage examinations via an online environment. It can be done through the Internet/Intranet and/ Local Area Network environments. Problems arising from human hacking or technical difficulties may lead to questioning of reliability and efficiency of the online exams. The system architecture proposed in this paper provides integrated management of passwords that prevent unauthorized access by the other users who nowadays are a havoc for security of the portals. In this paper, the combination of CAPTCHA and picture password system is proposed which improved the capability of resistance to the attack by malicious programs. 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. Graphical passwords, which consist of clicking on images rather than typing alphanumeric strings, may help to overcome the problem of creating secure and memorable passwords. Our results showed that this combination is practical in the aspects of security and usability.

CATCHA, Online Exam Portal, Picture Password, Security

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