Four digits that you learn by heart. Your bank card code is a secret that you will surely take with you to your grave. You are often told to keep it to yourself, not to write it down on a piece of paper and even less on your mobile phone. Even your bank asks you to destroy the courier mentioning it after receiving your credit card.

If it is essential never to disclose it, it is to avoid hacking your bank account. Without this PIN, scammers can’t do much, which is good news. The bad news is that it is very easy for them to guess it and therefore act quickly, even before you have objected. Nick Berry is a data scientist at Facebook and, on his blog, he explains that he studied the least secure digital codes, which Planet summarized for you in a previous article.

Fortunately, there are also some codes that are harder to guess than others. You do not know how to change yours, too simple, for a more elaborate combination? Ask your bank advisor, as some establishments offer the possibility of doing it directly at an ATM. For others, this change involves sending a new bank card.

If you can choose your credit card code, be careful not to choose any combination. So we forget his birthday year, that of his first child or his dog. You do not know what to pick ? Discover below the most difficult combinations to guess.