To protect against fraud, U.S. banks will be issuing credit cards with small computer chips. But some experts say using a PIN to complete a transaction is more secure than a signature. iStockphoto hide caption

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Kmart says it has removed malware that had infected its checkout registers in stores. The company believes the malware may have been in place for about a month before it was detected. Rachel Murray/Getty Images hide caption

itoggle caption Rachel Murray/Getty Images

Apple CEO Tim Cook speaks in Cupertino, Calif., on Tuesday. The company unveiled a new mobile payment system called Apple Pay, which uses security built into the latest iPhones. Justin Sullivan/Getty Images hide caption

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Lunch at the West Salem School District in Wisconsin. Michelle Kloser/ for NPR hide caption

itoggle caption Michelle Kloser/ for NPR