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Biometric access-control systems-those using fingerprints, [#permalink]
01 Apr 2004, 07:22
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Biometric access-control systems-those using fingerprints,
voiceprints, etc., to regulate admittance to restricted areas-work by
degrees of similarity, not by identity. After all, even the same
finger will rarely leave exactly identical prints. Such systems can
be adjusted to minimize refusals of access to legitimate access-
seekers. Such adjustments, however, increase the likelihood of
Which of the following conclusions is most
strongly supported by the information above?
(A) If a biometric access-control system were made to work by
identity, it would not produce any correct admittance decisions.
(B) If a biometric access-control system reliable prevents impostors
from being admitted, it will sometimes turn away legitimate access
(C) Biometric access-control systems are appropriate only in
situations in which admittance of impostors is less of a problem than
is mistaken refusal of access.
(D) Nonbiometric access-control systems-based, for example, on
numerical codes are less likely than biometric ones to admit
(E) Anyone choosing an access-control system should base the choice
solely on the ratio of false refusals to false admittances.
Because making the system fool proof might call for readjusting the system so as to make it comply with very stringent standards. Stringent standards would mean no margin for errors. But we know that the system works on the principle of similarity and not identity because " After all, even the same finger will rarely leave exactly identical prints". The system might reject even legitimate users in case of an increased deviation from pre-established standards for that particular user.