So there are just two possibilities how that could have happened: Either the card data has been skimmed or somebody got access to my computer. I am asking because I recently became a victim of a card fraud, as somebody managed to withdraw cash from an ATM in Belize (and I am from Germany, by the way). because somebody got access to my computer and my password database, where this information was stored in)? Or in other words: Is there a chance that there are ATMs somewhere that would allow cash withdrawal although the credit card copy does not have the correct CVC1 (or no CVC1 at all)? Would it be possible for fraudsters to create a working copy of my credit card if they only have my name, card number, expiration date and the PIN (e.g. You already touched that topic a little bit but I am still wondering: Thank you very much for this detailed post and making clear the differences between CVC1 and CVC2. Updated: 12.18.13 to correct CVC1 / CVC2 mix-up in last paragraph But they are not useful for minting actual plastic cards with valid magnetic stripe to use at an old-fashioned bricks-and-mortar store, due to the absence of CVC1. (Surprisingly some leading retailers including Amazon do not require CVC2, so this turns out not to be major impediment for the aspiring criminal.) Going in the other direction, when yet another website processing credit cards experiences a data breach, the spoils from this stunt can be used for additional online/mail-order/phone-order transactions. But unless our enterprising waiter also remembered to write down or photograph the CVC2 from those cards, they can not be used for any online purchase where the merchant validates CVC2. The resulting cache of contraband information can be used to forge additional cards and used to make in-store payments compliments of unsuspecting diners. It effectively creates a “firewall” between virtual and in-store fraud. Suppose a waiter has taken to swiping all customer credit cards through his very own mag-stripe reader to save a copy of the track data. This has important ramifications on managing risks due to theft of payment information. It is not possible to use the CVC1 for making a purchase online, or encode CVC2 into a magnetic stripe for a successful swipe transaction. It is only intended for authenticating the card owner during the purchase.ĬVC2 and CVC1 are by design incompatible. For example: while card numbers, expiration date and billing address can be saved for future use to simplify later transactions, CVC2 can not be stored by the merchant. (The extra digit can be viewed as balancing out the fact that AmEx cards have 15 digits, one less than other major brands.) PCI standards impose stringent constraints on handling of CVC2. While CVC1 is encoded in the magnetic stripe, CVC2 is only printed on the card itself– three-digits on the back under the magnetic stripe for Visa, Mastercard and Discover, and four-digits on the front for American Express. It also prevents easy fabrication of credit cards: while track data is relatively predictable given the card number, expiration date and other fields, CVC1 does not have any predictable pattern that allows derivation from the other pieces.ĬVC2 serves a similar purpoes but is used in conjunction with card-not-present or “CNP” transactions such as ecommerce when the user types card information into a web browser. Much like a message authentication code, the CVC simplifies the process of authenticating track data when it is received by the issuing bank. which serves as a cryptographic integrity check on the track contents. One of the fields in this track layout is the Card Validation Code (CVC) or CVC1. The data encoded on the magnetic stripe is static, formatted according to ISO7813 in three tracks, with the third one typically unused. Swipe transaction are perhaps easiest to describe. Each of these involves a slightly different protocol, relying on different characteristics of the card data to authenticate the card. When the merchant and card-holder are not in the same place, the purchase is instead conducted by relaying the card number, expiration date, perhaps the billing address and an additional number printed on the card dubbed CVV2. More fashionable recently are contactless payments, where the card is tapped against a reader, as in Mastercard Paypass, Visa PayWave or Discover Zip. In a pinch when there are no point-of-sale terminals present, getting an imprint of the card by pressing a carbon paper over it will do. At the implementation view, involves reading the data encoded in the magnetic stripe on the back. Swiping a credit card through a magnetic stripe reader is perhaps the most common way of using a plastic card for payments.
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