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by Aqua_Geek
5505 days ago
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> Because the magnetic stripe contains a security code that's not otherwise represented on the card. Not really: http://en.wikipedia.org/wiki/Magnetic_stripe_card The stripe usually just has the cardholder name, the card number, expiration date, and sometimes the CVV. It depends a lot on what tracks are present on the card, what info your bank has included in the "discretionary data" chunk, which track was read by the reader, etc. If you grab a cheap USB magstripe reader, you'll find that most things (library cards, student IDs, airline tickets, etc) really don't include much of anything that is not already printed on the item. There are technologies like MagnePrint (http://www.magneprint.com/) that use the signature of the ferrous oxide particles on the card. But it requires your bank and the merchant to use the tech. |
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http://en.wikipedia.org/wiki/Card_security_code
"The first code, called CVC1 or CVV1, is encoded on the magnetic stripe of the card and used for transactions in person. The purpose of the CVC1 or CVV1 is to ensure the data stored on the magnetic stripe of the card is valid and was generated by the issuing bank. This value is submitted as part of transactions and is verified by the issuing bank. A limitation of the CVC1 or CVV1 is that if the entire magnetic stripe is copied, rather than generated, the card can be duplicated. See the Skimming section for more details.
The second code, and the most cited, is CVV2 or CVC2. This CSC (also known as a CCID or Credit Card ID) is often asked for by merchants for them to secure card not present transactions occurring over the Internet, by mail, fax or over the phone. In many countries in Western Europe, due to increased attempts at card fraud, it is now mandatory to provide this code when the cardholder is not present in person."