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How it works
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Decision – The result of the comparison between the score and the
threshold. The decisions a biometric system can make include match,
non-match, and inconclusive, although varying degrees of strong
matches and non-matches are possible. Depending on the type of
biometric system deployed, a match might grant access to resources,
a non-match might limit access to resources, while inconclusive may
prompt the user to provide another sample.
One of the most interesting facts about most biometric technologies
is that unique biometric templates are generated every time a user
interacts with a biometric system. As an example, two immediately
successive placements of a finger on a biometric device generate
entirely different templates. These templates, when processed by a
vendor’s algorithm, are recognizable as being from the same person,
but are not identical. In theory, a user could place the same finger
on a biometric device for years and never generate an identical
template.
Therefore, for most technologies, there is simply no such thing as a
100% match. This is not to imply that the systems are not secure –
biometric systems may be able to verify identify with error rates of
less than 1/100,000 or 1/1,000,000. However, claims of 100% accuracy
are misleading and are not reflective of the technology’s basic
operation.
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