Or you can just use PayPal. It is VERY safe and a hack of PayPal would be like hacking a major banking institution. They are a group I don't worry about. I use PayPal now for almost all my online purchases.
Actually, I work with a guy whose credit card information he used through PayPal was stolen. He learned about this when someone purchased several hundred dollars worth of soccer equipment.
Truth is that nothing is safe from hackers. The best thing is to never, ever have online businesses store your credit card numbers. Check your credit card statement often if you plan on purchasing online.
That said, I still purchase online, from Amazon, PayPal, and DriveThruRpg. You just have to be cautious.
Retreater