That 3-digit number is your Card Security Code. If your CSC number has been scratched off or is not visible you will need to contact your credit card company or bank for additional information. How to ...

In troubling news, a paper from researchers at Newcastle University in the UK claims that Visa's credit ... numbers to guess combinations of card numbers, expiration dates and CVV codes (that ...

As you look for strategies to increase the number ... president at Visa. Both the expiration date and the CVV, or security code, serve as additional security features on your card.