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Traditional identity verification in computer systems are done based on Knowledge based and token based identification these are prone to fraud. Unfortunately, these may often be forgotten, disclosed or changed. A reliable and accurate identification/verification technique may be designed using biometric technologies. Biometric authentication employs unique combinations of measurable physical characteristics - fingerprint, facial features, iris of the eye, voice print, hand geometry, vein patterns, and so on - that cannot be readily imitated or forged by others. Unimodal biometric systems have variety of problems such as noisy data, intra-class variations, restricted degree of freedom, non-universality, spoof attacks, and unacceptable error rates.
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