Which of the following biometrics devices has the highest Crossover Error Rate (CER)?

A.
Iris scan

B.
Hand geometry

C.
Voice pattern

D.
Fingerprints

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.
Voice pattern biometrics have the highest Crossover Error Rate (CER). This is because voice patterns tend to
change with the individual’s mood and health. The common cold or flu, for instance, would alter the tone and
pitch of a person’s voice.
Incorrect Answers:
A: Iris scan biometric devices do not have the highest Crossover Error Rate (CER) due to the accuracy of an
iris scan and the fact that the iris rarely changes.
B: Hand geometry biometric devices do not have the highest Crossover Error Rate (CER) due to the accuracy
of a hand geometry scan the fact that the hand rarely changes.
D: Fingerprint biometric devices do not have the highest Crossover Error Rate (CER) due to the accuracy of
fingerprint scan the fact that the fingerprint rarely changes.

Krutz, Ronald L. and Russell Dean Vines, The CISSP and CAP Prep Guide: Mastering CISSP and CAP, Wiley
Publishing, Indianapolis, 2007, p. 59