Biometric authentication is an automated method whereby an individual's identity is confirmed by examining a unique physiological trait or behavioural characteristic, such as a fingerprint, iris, retina, or signature. Physiological traits are stable physical characteristics, such as finger prints, palm prints and iris patterns. This type of measurement is essentially unalterable. A behavioural characteristic - such as one's signature, voice, or keystroke dynamics - is influenced by both controllable actions and less controllable psychological factors. Because behavioural characteristics can change over time, the enrolled biometric reference template must be updated each time it is used. Although behaviour-based biometrics can be less expensive and less threatening to users, physiological traits tend to offer greater accuracy and security. In any case, both techniques provide a significantly higher level of identification than passwords or smart cards alone This group is for those who wish to contribute in biometrics
