Biometric Authentication is any process that validates the identity of a user who wishes to sign into a system by measuring some intrinsic characteristic of that user.

Biometric samples include finger prints, retinal scans, face recognition, voice prints and even typing patterns.

Biometric Authentication depends on measurement of some unique attribute of the user. They presume that these user characteristics are unique, that they may not be recorded and reproductions provided later, and that the sampling device is tamper-proof.

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