characteristics (such as fingerprint or voice patterns), especially as a means of verifying personal identity”. (Merriam-Webster Encyclopedia, 2013) Other characteristics include face, hand geometry, vein, and iris recognition. The trait needs to be something that doesn’t change a lot over time. Other methods of authentication still in use is what the user knows, such as a password, or answers to secret questions personalized to that user, or what the person has, such as a key, pin number, or a keycard…
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