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Credit Card FAQ - Credit Card Security And Authentication
1. How does the ATM or store terminal know my PIN number?
PIN (personal identification numbers) are the most often used way to authenticate your identity when you use your credit or ATM card. When you first choose your PIN number, it is 'encrypted' - stored in a secret code of letters and symbols - and either stored in a database or on the magnetic stripe on the back of your card.
2. If my PIN number is stored in a database, doesn't that mean that bank or credit card employees have access to it?
The encryption method that's used by ATM and credit cards is called 'one-way encryption'. It makes it easy for the bank's computer to verify the PIN given the bank's key and the PIN, but ne...
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