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A system that uses some ____________________ human characteristic to determine the identity of the user of a computer system . Typical characteristics that have been used include : typing characteristics , such as the ____________________ of typing or the number of ____________________ made ; the image of a ____________________ ; fingerprints ; hand ____________________ ; handwriting characteristics ; voice ____________________ ; DNA patterns ; and eye characteristics ; voice such as the ____________________ of blood vessels in the retin a