Authentication is one of the most important security service provided to system by the different authentication schemes or algorithms which must be provided so that only authorized persons can have right to use or handle that system and data related to that information system securely. Techniques used include token based, biometric based as well as knowledge based. Despite these, no single mechanism is efficient and effective to provide adequate security for computing resources such as programs, files, messages, printers, internet, etc. A 3 – level authentication is proposed in this paper that is more confidential for ensuring adequate security.
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