Remember this The third factor of authentication (something you are, defined with biometrics) is the strongest individual method of authentication because it is the most difficult for an attacker to falsify. Biometric methods include fingerprints, retina scans, iris scans, voice recognition, and facial recognition. Iris and retina scans are the strongest biometric methods mentioned in this section, though iris scans are used more than retina scans due to the privacy issues and the scanning requirements. Facial recognition is the most flexible and when using alternate lighting (such as
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