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CISSP - FAR, FRR, CER






What is false acceptance rate?
FAR = the percent of unauthorized users incorrectly matched to a valid user's bio metric parameter





What is false rejection rate?
FRR = the percent of incorrectly rejected valid users





What is crossover error rate?
The Crossover Error Rate (CER) describes the point where the False Rejection Rate (FRR) and False Accept Rate (FAR) are equal. CER is also known as the Equal Error Rate (EER). The Crossover Error Rate describes the overall accuracy of a biometric system.





Moral of the story: As the sensitivity of a biometric system increases, FRRs will rise and FARs will drop. Conversely, as the sensitivity is lowered, FRRs will drop and FARs will rise.


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