You will find either the entire 16-digit card number OR just the last 4 digits, followed by the 3-digit number. That 3-digit number is your Card Security Code. If your CSC number has been scratched ...
For cards like Visa, RuPay, MasterCard and Discover, you will find a 3 digit ... service code, and Data Encryption Standard (DES) keys for protection. The exact algorithms used in the process remain ...
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