A retinal scan is an example of a 'something you are' factor in multifactor authentication, as it relies on the unique biological traits of an individual's retina. This factor is based on physical characteristics that are inherent to an individual and cannot be transferred or guessed, unlike a digital certificate which is 'something you have' or a password which is 'something you know'.
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What are the different types of factors in multifactor authentication?
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What are biometric factors and how do they enhance security?
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Why are passwords considered 'something you know' and what are their limitations?