MC or any other credit card company have security department who can answer all your concerns and inquires. If you are planing to apply for CC , make sure you read all about your privacy and as well security level they will provide for you as consumer. I prefer prepaid credit card specially for online purchase or any type of transaction that include payments through online. You load the card with certain amount and you know how much you are spending, and you control pretty much every transaction. If you are using CC that's issued to you with max credit it's always bigger risk to get your money stolen ( it's not even your money- creditor money that you are responsible to pay back with interest ). This is just my personal opinion.