� A camera is used to capture a user's face and match facial features with a database of known users
� Finger scanning
� A light scanner is used to read the unique whorls on fingertips
� Hand scanning
� This type of scanner scans an entire hand or the palm of a hand, which provides unique identification information without the higher resolutions required in finger scanners
� Iris/retina scanning
� Eye scanners may provide the most accurate identification, but users may be apprehensive about using them.