Certified Information Systems Auditor CISA · Free Practice Question Medium
Question 99
Which of the following best describes the term “crossover error rate” in the context of biometric authentication mechanisms?
- A The point at which the maximum threshold of allowable authentication errors is reached and the system becomes unusable.
- B The point at which the false reject rate (FRR) equals the false accept rate (FAR). This is the ideal point for a well-tuned biometric system.
- C The rate at which valid subjects are rejected. This occurs when the biometric system has too small a margin for error.
- D The rate at which invalid subjects are accepted as valid. This occurs when the biometric system has too large a margin of error.
Reveal correct answer
Correct answer: B
Explanation
Correct Answer:
The point at which the false reject rate (FRR) equals the false accept rate (FAR). This is the ideal point for a well-tuned biometric system is correct.
Incorrect Answers:
The rate at which valid subjects are rejected, and the rate at which invalid subjects are accepted as valid are the definitions of false reject rate and false acceptance rate, respectively.
The point at which the maximum threshold of allowable authentication errors is reached and the system becomes unusable is an invalid definition.
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