In the context of Biometric authentication, there is a quick way to compare the accuracy of devices. In general,
the devices that have the lowest value would be the most accurate. Which of the following would be used to
compare accuracy of devices?
A.
the CER is used.
B.
the FRR is used
C.
the FAR is used
D.
the FER is used
Explanation:
There are three main performance measures in biometrics. These measures are as follows:
False Rejection Rate (FRR) or Type I Error. The percentage of valid subjects that are falsely rejected.
False Acceptance Rate (FAR) or Type II Error. The percentage of invalid subjects that are falsely accepted.
Crossover Error Rate (CER). The percent in which the False Rejection Rate equals the False Acceptance
Rate.
Almost all types of detection permit a system’s sensitivity to be increased or decreased during an inspection
process. If the system’s sensitivity is increased, such as in an airport metal detector, the system becomes
increasingly selective and has a higher FRR. Conversely, if the sensitivity is decreased, the FAR will increase.
Thus, to have a valid measure of the system performance, the CER is used.
Incorrect Answers:
B: FRR is the percentage of valid subjects that are falsely rejected. It is not used to compare accuracy of
biometric devices.
C: FAR is the percentage of invalid subjects that are falsely accepted. It is not used to compare accuracy of
biometric devices.
D: FER is not used to compare accuracy of biometric devices.Krutz, Ronald L. and Russell Dean Vines, The CISSP and CAP Prep Guide: Mastering CISSP and CAP, Wiley
Publishing, Indianapolis, 2007, p. 59
https://en.wikipedia.org/wiki/Biometrics