SSCP · Question #916
When a biometric system is used, which error type deals with the possibility of GRANTING access to impostors who should be REJECTED?
The correct answer is B. Type II error. Biometric systems have two key error types: Type I error (False Rejection Rate, FRR) occurs when a legitimate user is incorrectly rejected. Type II error (False Acceptance Rate, FAR) occurs when an impostor is incorrectly accepted and granted access. Granting access to an imposto
Question
When a biometric system is used, which error type deals with the possibility of GRANTING access to impostors who should be REJECTED?
Exhibit
Options
- AType I error
- BType II error
- CType III error
- DCrossover error
How the community answered
(25 responses)- B88% (22)
- C8% (2)
- D4% (1)
Explanation
Biometric systems have two key error types: Type I error (False Rejection Rate, FRR) occurs when a legitimate user is incorrectly rejected. Type II error (False Acceptance Rate, FAR) occurs when an impostor is incorrectly accepted and granted access. Granting access to an impostor who should be rejected is a Type II error - a false positive for identity. This is generally considered the more dangerous error in security contexts because it results in unauthorized access. The Crossover Error Rate (CER/EER) is the point where FRR equals FAR, used to compare biometric system accuracy.
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