Using body parts to prove 'I am who I say I am'
By Marsha Walton CNN Friday, December 3, 2004 Posted: 11:22 AM EST (1622 GMT) MORGANTOWN, West Virginia (CNN) -- Humans have always recognized one another through physical traits: seeing a loved one walk through the door, hearing your boss's voice on the phone, finding the right tribal campfire. Visual cues have helped us to differentiate friend from foe. But what happens when technology enters the equation, and a machine determines whether "you" are really "you"? Biometrics, an automated way to authenticate a person's identity, is being used from airports to grocery stores for both security and convenience.