Here’s a puzzle that troubled Shyam Gol-
lakota, a computer scientist at the Univer-
sity of Washington: How do you transmit a
password to a smart device—say, a door
lock—without using hacker- prone Wi-Fi or
Bluetooth? “The human body was the per-
fect solution,” says Gollakota. He found
that a relatively low frequency signal can
be sent from a smartphone's fingerprint
sensor via the body to the object that
needs to be unlocked.
How it works
A signal is generated by
the fingerpint sensor
on a smartphone.
The signal is transmitted
via a small electric current
across the body, with no
known health impacts.
When the signal reaches
a sensor on a terminus
(such as a doorknob),
the object is unlocked.
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