Atm card magnetic strip

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How does a magnetic stripe on the back of a credit card work?

Magnetic stripe card - Wikipedia

Information Security Stack Exchange is a question and answer site for information security professionals. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Recently I received a new debit card which has both a magnetic stripe and a chip as did my previous card.

Why EMV chip cards are replacing magnetic stripes

Back to Previous. Most of us never gave much thought to the black strip on the back of our credit cards. Banks, credit card networks and security experts praised the safer chip card technology. Still, there was—and still is—resistance to change. Many consumers and merchants prefer the familiar ease of swiping at the register.
The magstripe is made up of tiny iron-based magnetic particles in a plastic-like film. Each particle is really a very tiny bar magnet about 20 millionths of an inch long. The magstripe on the back of the card is very similar to a piece of cassette tape fastened to the back of a card.