Biometric systems become common over the years. Their ease of use for the end
user and their perceived security make them seem to be the best solution to
any problem involving user authentication. Although biometric systems can provide
fast and secure user authentication with minimal user intervention, they have
several inherent limitations making them inappropriate for most environments
where authentication is used. The focus of this paper is not the possible use-cases
of biometry, but rather it is those limitations that are neither biometry-type
specific nor implementation specific and that make biometric measures limited
in their scope of possible uses.
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