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Network security is the prevailing and challenging factor in computer communications. Computer security and communication security are interrelated and essential features in the internetworking system. Network security is ascertained by many factors like authentication, authorization, digital signatures, cryptography, steganography, etc. Among them authentication is playing an important role in networked communications, where the communicating partners are to be identified each other legitimately. Authentication process ensures the legitimacy of the communicating partners in networked communication. In an authentication process, the originator of the communication and the respondent transact some identification codes to each other, prior to start of the message transaction.
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