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Magnetic Stripe

Data on the magnetic stripe is encrypted by polarizing tiny magnetic particles with a special encoder in either south or north pole direction.

cards
‍Magnetic cards are often replaced with proximity or smart cards because they are easy to duplicate

The encoded information is accessed by swiping the cards' stripe through a reader.  A magnetic card reader, which is a microcontroller-based device, can detect polarity that was stored on the strip and release the door.

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