Biometrics - How Biometrics Works

Usually, biometric systems require two forms of input for identity verification. Typically, these include the biometric input along with a personal identification number (PIN). Upon receiving the PIN, the computer accesses its stored database and locates the biometric template for that individual. The computer scans the two biological features looking for differences and, if it produces an exact match, verifies the individual's identity and grants access. In a simple identification system, on the other hand, the computer receives no cues from PINs or access cards, and scans its entire database of biometric templates looking for a match. As a result, these systems must be more powerful.