All mainstream credit card numbers obey a mathematical trick designed to catch the most common typos. It’s called the Luhn ...

You’re at the checkout screen after an online shopping spree, ready to enter your credit card number. You type it in and ...

Most of us use credit cards regularly, but very few know how these cards actually work. Recently, a software engineer and ...

What is a virtual card number and how do I get one? If you’re a frequent online shopper, you’re more at risk of becoming a cybercrime victim. In fact, a recent study conducted by Security.org ...

When adding the check number to the rest of the numbers on the card, the sum should equal 0. If you enter the wrong number during an online purchase, it will be detected right away, as the sum won ...