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Magnetic stripe on the back of credit card

all information regarding magnetic strip cards

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Magnetic stripe on the back of credit card

  1. 1. Sudhanshu Rathore 2nd yr Electrical
  2. 2. Details on card
  3. 3. Magnetic Stripe  A magnetic stripe card is a type of card capable of storing data by modifying the magnetism of tiny iron-based magnetic particles on the band of magnetic material on the card.  The magnetic stripe is sometimes called swipe card or magstripe.  This is read by swiping past a magnetic reading head.  This 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 magnetic stripe can be written because the tiny bar magnets can be magnetized.
  4. 4.  This can be done either in a north or south pole direction.  The magnetic stripe on the back of a credit card is similar to a piece of cassette tape fastened to the back of a card.  Instead of motors moving the tape so it can be read, our hand provides the motion as we swipe a credit card through a reader or insert at the gas station pump.
  5. 5. Design of card
  6. 6. Track 1  Track 1 is the only track that may contain alphabetic text, and hence is the only track that contains the card holder’s name.  The minimum cardholder account information needed to complete a transaction is present on both track 1 and track 2.
  7. 7. Track 2  Track 2 format was developed by the banking industry (ABA).  This track is written with a 5-bit scheme (4 data bits + 1 parity), which allows for sixteen possible characters, which are the numbers 0-9, plus the six characters : ; < = > ?.  The selection six punctuation may seem odd, but in fact the sixteen codes simply map to the ASCII range 0x30 through 0x3f, which defines ten digit characters plus those six symbols.  Point-of-scale card readers almost always read track 1, or track 2, and sometimes both, in case one track is unreadable.  The minimum cardholder account information needed to complete a transaction is present on both track 1 and track 2.
  8. 8. Track 3  Track 3 is a read-write track, but its usage is not standardized among banks.  This track includes an encrypted PIN, country code, currency units, amount authorized.  Track 3 is virtually unused by major worldwide networks.  This is often isn’t even physically present on the card by virtue of a narrower magnetic stripe.
  9. 9. How it works?  After we or the cashier swipes the credit card through a reader, the EDC software at the point of sale (POS) terminal dials a stored telephone number via a modem to call an acquirer.  An acquirer is an organization that collects credit authentication requests from merchants and provides a payment guarantee to the merchant.  When the acquirer company gets the credit card authentication request, it checks the transaction for validity and the record on the magstripe for:  Merchant ID  Valid card number  Expiration Date  Credit card limit  Card usage.
  10. 10.  Single dial-up transactions are processed 1200-2400 bps, while direct internet attachment uses much higher speeds via this protocol.  In this system, the cardholder enters a Personal Identification Number (PIN), using a keypad.
  11. 11. Problems why an ATM doesn’t accept the card?  If the ATM isn’t accepting our card, the problem is probably either:  Dirty or scratched magstripe.  Erased magstripe (The most common causes for erased magstripes are exposures to magnets, like the small ones used to hold notes and pictures on the refrigirator, and a store’s electronic article surveillance (EAS) tag demagnetizer.

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