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Reliable user authentication is becoming an increasingly important task in the Web-enabled world. The consequences of an insecure authentication system in a corporate or enterprise environment can be catastrophic, and may include loss of confidential information, denial of service, and compromised data integrity. The value of reliable user authentication is not limited to just computer or network access. Many other applications in everyday life also require user authentication, such as banking, e-commerce, and physical access control to computer resources, and could benefit from enhanced security.

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One of the greatest revolutionary innovations of the twentieth century is Internet. The Internet is a global system of interconnected computer networks that use the standard Internet Protocol Suite (TCP/IP) to serve billions of users worldwide. It is a network of networks that consists of millions of private and public, academic, business, and government networks of local to global scope that are linked by a broad array of electronic and optical networking technologies.

Rapidly, there is a dramatic change in the way we communicate, do business, educate ourselves and entertain ourselves. Perhaps even the architects of Internet would not have foreseen the tremendous growth rate of the network being witnessed today. It made the ‘global village utopia ‘ a reality in a rather short span of time.

Using the internet it is easy for the people to exchange ideas, resources and information. Likewise there are millions of users to the Internet and the drawback of the Internet is that it cannot adequately support many services being imagined, such as interconnection of gigabit networks with lower bandwidths, high security applications and interactive virtual reality applications.

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