You see, each person's body provides a different amount of opposition to electrical current, so bioimpedance can be a unique biometric identifier.
ENGADGET: Researchers use bioimpedance as a biometric, let health monitor devices know who you are
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So, we're a ways off from bioimpedance-based security, but research is ongoing, and you can learn all about it at the source below.
ENGADGET: Researchers use bioimpedance as a biometric, let health monitor devices know who you are
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Researchers from Dartmouth have come up with a new way to provide health monitors just such an ability using a tiny electric current and a bioimpedance sensor.
ENGADGET: Researchers use bioimpedance as a biometric, let health monitor devices know who you are