During an operational audit of a biometric system used to control physical access, which of the following should be of GREATEST concern to an IS auditor?
A false negative would be someone who is supposed to have access that scans and gets denied. It's a negative result, and false.
A false positive would be someone who should not have access, but the scan allows them in anyway.
false positive
As per Isaca: False-acceptance rate (FAR) is the frequency of accepting an unauthorized person as authorized, thereby granting access when it should be denied. In an enterprise with high security requirements, limiting the number of false acceptances is more important than the impact on the false reject rate.
I completly disagree with letter C. Given unauthorized people to access any place is a greatest concern that not granting an allowed person to it. It's unauthorized access.
Q: the GREATEST concern for a biometric system used to control PHYSICAL access
Answer: C - False Negative
if it was about a biometric system used to control logical access then the greatest concern is A False Positive
False negatives occur when the biometric system fails to correctly identify an authorized user, leading to a denial of access to individuals who should be granted access
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