PT0-001 Question #84: Real Exam Question with Answer & Explanation

The correct answer is A: The biometric device is tuned more toward false positives. The attacker accessed the system using their own unregistered fingerprint without exploitation, indicating the biometric device has a high False Acceptance Rate - it is tuned to err on the side of granting access.

Question

After several attempts, an attacker was able to gain unauthorized access through a biometric sensor using the attacker's actual fingerprint without exploitation. Which of the following is the MOST likely explanation of what happened?

Options

AThe biometric device is tuned more toward false positives
BThe biometric device is configured more toward true negatives
CThe biometric device is set to fail closed
DThe biometnc device duplicated a valid user's fingerpnnt.

Explanation

The attacker accessed the system using their own unregistered fingerprint without exploitation, indicating the biometric device has a high False Acceptance Rate - it is tuned to err on the side of granting access.

Common mistakes.

B. True negatives represent the system correctly rejecting unauthorized individuals, which is the opposite behavior of what occurred here.
C. Fail closed means the device denies access when it encounters an error or failure condition, which would prevent unauthorized entry rather than allow it.
D. The question explicitly states the attacker used their own actual fingerprint without exploitation, ruling out any cloning or duplication of a legitimate user's biometric data.

Concept tested. Biometric false acceptance rate and sensor sensitivity tuning

Reference. https://csrc.nist.gov/glossary/term/false_acceptance_rate

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