In science fiction movies, computers have been checking handprints, listening to voices, or scanning eyes to ensure that only authorized personnel can access systems for years. But such security checks, called biometric systems, are no longer limited to Hollywood reels; a small but growing number of organizations are deploying systems that compare an individual's biological characteristics (such as face, fingerprints, or voice) against others before granting access to secure areas.

This technique exploits the fact that biological characteristics are singular, unchanging, and difficult to lose, transfer, or forget. Consequently, they tend to be more reliable, user friendly, and secure

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