how do you protect yourself? >> read your entire credit card line by line by line. >> if fraud does occur, credit card companies say they pay the costs. so be on alert. check your credit card statement for small charges. >> i'm not going to buy a $5,000 item. i'm going to spend $20 or $100. >> those micro charges. >> reporter: and there's a solution in your kitchen. wrap the card in aluminum foil. >> tin foil actually works? >> it's so simple, isn't it? >> a low-tech fix to a high-tech problem. >> it's amazing. tin foil. something that simple can keep you it just blocks whatever it is that the information of information from one thing to another. if we can figure that out, why can't the credit card companies, the folks making these come up with a simple fix. hackers are that smart? >> i'm looking for that chip. i'm really excited about that. the brand new trailer for "fifty shades of grey," plus will and kate out on the town with one direction.