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 ...

Your credit cards consist of a three digit security number which is known as a CVV (Card Verification ... or four-digit code printed on your credit, typically found on the back of the card near the ...

For cards like Visa ... code, and Data Encryption Standard (DES) keys for protection. The exact algorithms used in the process remain undisclosed to maintain security. With this method, CVV ...