As organizations search for more secure authentication methods for user access, e-commerce, and other security applications, biometrics is gaining increasing attention.

Biometrics measure individuals' unique physical or behavioral characteristics to recognize or authenticate their identity. Common physical biometrics include fingerprints; hand or palm geometry; and retina, iris, or facial characteristics.

Behavioral characters include signature, voice, keystroke pattern, and gait. Of all these biometrics, technologies for fingerprint and hand are the most developed.

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