Biometrics is often refered to as "three factor" authentication, referring to the objective of establishing not only what you know and what you have, but also (or instead) what you are.

Biometric technologies at a glance

NEEDS MORE WORK / CROSS REFERENCES

CURRENT BIOMETRICS

Fingerprint

Iris scan

Hand scan

Voice print

OBSOLETE BIOMETRICS

Retina Scan

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