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Biometrics are intended to make human-machine interaction systems simpler, which makes them safer and more convenient. However, the vast majority of human-machine interfaces contain two opposing interests, contradicting needs: protection and privacy. Biometrics is much like any other type of computerised system: a working, functioning, and fast system are prerequisites. Finally, more importantly, biometric systems must overcome both the hesitancy in identification procedures and the fear of misuse of personal data in order to increase acceptance by the general public.
A problem with most widely adopted biometric technologies is the obtrusive process of gathering their required biometric features..