myriad of technical solutions to the problem of outside hackers. For example, physical barriers like electronic card keys with programmable microchip memories are useful, but have the major drawback that they can be stolen. Even more secure are the new biometric devices which identify a person by physical idiosyncracies like voice inflection, hand prints, or typing habits. Many companies also block hackers with automatic dial-back systems which ensure that an incoming call is from an authorized number. Unfort
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