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difference score

The value returned by a biometric engine that indicates the degree of difference found between a reference biometric sample (e.g. the data on file) and the data being obtained for comparison.

See "Defend Yourself Against Identity Theft" in the "Did You Know..." section of Webopedia.
See also "How Biometrics Security Works" in the "Did You Know..." section of Webopedia
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Also see "How Fingerprint Scanners Work" in the "Did You Know..." section of Webopedia
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