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"Another reason why privacy could be just a passing fad, terrorism is going to get too good. [1997]"
- Larry Niven

Neural Door Lock  
  A device that provides access based on neurological data.  

The front door was locked. Standing in the carpeted hallway, Beam skillfully tilted with the door mechanism. It was geared to respond to specific neural patterns: those of its owners and a limited circle of friends. For him there was no activity.

Kneeling down, Beam switched on a pocket oscillator and started sine wave emission. Gradually, he increased the frequency. At perhaps 150,000 cps the lock guiltily clicked; that was all he needed. Switching the oscillator off, he rummaged through his supply of skeleton patterns until he located the closet cylinder. Slipped into the turret of the oscillator, the cylinder emitted a synthetic neural pattern close enough to the real thing to affect the lock.

The door swung open. Beam entered.

From The Unreconstructed M, by Philip K. Dick.
Published by Science Fiction Stories in 1957
Additional resources -

Compare to Dick's cephalic pattern door from his 1965 novel The Zap Gun.

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