The CVV is a 3- or 4-digit code printed on your credit card. It's a fraud-prevention measure designed to make it harder to use info stolen in a data breach.

As tempting as it might be, avoid using 0000 as your four-digit PIN code. Same goes for 1010, 1111, 1122, and 1212, which comprises the top five worst PIN codes, according to a list compiled by ...

Many of us use the same 4-digit code for everything. Phones, credit cards, and even padlocks. A new report has shown that millions of people are using identical PIN codes, making phones and bank ...

Your card number is carefully structured. The very first digit is what’s known as the major industry identifier. A 4 means ...

Resetting a Kwikset lock involves removing the battery pack and holding down a button, while changing the code can be done ...

While it's a good start to avoid using the most common 4-digit PIN numbers, it's also important to note that, as we've made clear, 4-digit passwords of any kind are very, very weak.