A biometric system is a computerized system that allows a user to be recognized based on his/her biometrics. It is based on four components: (1) a sensor module, which includes a reader/scanner used to acquire a raw biometric image from a user; (2) a feature extractor module, which extracts a feature set from the raw biometric image and creates a template for the user; (3) a matching and decision-making module, which compares a feature set extracted from the user with the ones existing in the database and makes a decision to either validate a claimed identity or classify the enrolled identities to identify a user; and (4) a database module, which is a repository of templates for users (Jain & Ross, 2008). Biometric systems function in two stages: (1) enrollment, and (2) recognition. In enrollment, a user provides a sample image of his/her biometric (i.e., fingerprint, iris) via the sensor module. Then, the feature extractor module extracts features of the user’s biometric and stores a unique template of that user’s biometric into a database.