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The Biometric based user authentication systems are highly secured and efficient to use and place total trust on the authentication server where biometric verification data are stored in a central database. Such systems are, prone to dictionary attacks initiated at the server side. Compromise of the authentication server by either outsiders or insiders do all user private data to exposure and may have serious repercussions to an organization. In this paper, it presents a practical fingerprint based user authentication and key exchange system. In this system, the minutia extracted from the fingerprint is stored in the encrypted form in the server's database, to overcome the dictionary attacks mounted by the server.
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