The CVV Number (Card Verification Value) on your credit card or debit card is a 3 digit number on VISA, MasterCard and Discover branded credit and debit cards. On your American Express branded credit or debit card it is a 4 digit numeric code.
The codes have different names:
American Express – CID or unique card code.
Debit Card – CSC or card security code.
Discover – card identification number (CID)
Master Card – card validation code (CVC2)
Visa – card verification value (CVV2)
CVV numbers are NOT your card’s secret PIN (Personal Identification Number).
You should never enter your PIN number when asked to provide your CVV. (PIN numbers allow you to use your credit or debit card at an ATM or when making an in-person purchase with your debit card or a cash advance with any credit card.)
Types of security codes:
CVC1 or CVV1, is encoded on track-2 of the magnetic stripe of the card and used for card present transactions. The purpose of the code is to verify that a payment card is actually in the hand of the merchant. This code is automatically retrieved when the magnetic stripe of a card is swiped on a point-of-sale (card present) device and is verified by the issuer. A limitation is that if the entire card has been duplicated and the magnetic stripe copied, then the code is still valid.
The most cited, is CVV2 or CVC2. This code is often sought by merchants for card not present transactions occurring by mail or fax or over the telephone or Internet. In some countries in Western Europe, card issuers require a merchant to obtain the code when the cardholder is not present in person.
Contactless card and chip cards may supply their own codes generated electronically, such as iCVV or Dynamic CVV.
Code Location:
The card security code is typically the last three or four digits printed, not embossed like the card number, on the signature strip on the back of the card. On American Express cards, the card security code is the four digits printed (not embossed) on the front towards the right. The card security code is not encoded on the magnetic stripe but is printed flat.
American Express cards have a four-digit code printed on the front side of the card above the number.
MasterCard, Visa, Diners Club, Discover, and JCB credit and debit cards have a three-digit card security code. The code is the final group of numbers printed on the back signature panel of the card.
New North American MasterCard and Visa cards feature the code in a separate panel to the right of the signature strip. This has been done to prevent overwriting of the numbers by signing the card.
Benefits when it comes to security:
As a security measure, merchants who require the CVV2 for card not present payment card transactions are required by the card issuer not to store the CVV2 once the individual transaction is authorized and completed. This way, if a database of transactions is compromised, the CVV2 is not included, and the stolen card numbers are less useful. Virtual Terminals and payment gateways do not store the CVV2 code, therefore employees and customer service representatives with access to these web-based payment interfaces who otherwise have access to complete card numbers, expiration dates, and other information still lack the CVV2 code.
The Payment Card Industry Data Security Standard (PCI DSS) also prohibits the storage of CSC (and other sensitive authorization data) post transaction authorization. This applies globally to anyone who stores, processes or transmits card holder data. Since the CSC is not contained on the magnetic stripe of the card, it is not typically included in the transaction when the card is used face to face at a merchant. However, some merchants in North America require the code. For American Express cards, this has been an invariable practice (for card not present transactions) in European Union (EU) states like Ireland and the United Kingdom since the start of 2005. This provides a level of protection to the bank/cardholder, in that a fraudulent merchant or employee cannot simply capture the magnetic stripe details of a card and use them later for card not present purchases over the phone, mail order or Internet. To do this, a merchant or its employee would also have to note the CVV2 visually and record it, which is more likely to arouse the cardholder’s suspicion.
Supplying the CSC code in a transaction is intended to verify that the customer has the card in their possession. Knowledge of the code proves that the customer has seen the card, or has seen a record made by somebody who saw the card.
