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Credit Card FAQ - Credit Card Security And Authentication
 by: Joseph Kenny

With the ever rising reports of credit card fraud, fraudulent use, internet phishing and identity theft, people are rightly concerned about credit card security. Here are some of the most frequently asked questions about credit card security.

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 nearly impossible to extract the PIN in text form from the encrypted database.

3. How does the machine 'read' my card?
The stripe on the back of your credit or ATM card is called a magnetic stripe.Written into the stripe are your account number and identifying data. When you swipe the card, that information is read and sent via modem to an 'acquirer' - a company that 'acquires' a payment guarantee from the credit card company based on the information stored on your card's magnetic stripe.

4. Isn't buying on the internet dangerous and insecure?
Your credit card information is in less danger being transmitted over the internet than it is when you hand your card to a store clerk at the counter. The real danger to your credit card information isn't from hackers hitting online merchants, or stealing your credit card information via modem or phone lines.

5. How do I protect myself from phishers?
First, never provide your social security number or other identifying data to anyone without first verifying that they are exactly who they say they are. Experts recommend that you never use the link provided in an email to go to the site of someone you do business with. Instead, open a new browser window and type in the known address by hand.

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