Steve writes, "In a key step to help businesses better understand and protect themselves against the risks of fraud, Visa USA and the U.S. Chamber of Commerce announced the five leading causes of data breaches and offered specific prevention strategies. The report states that the most common cause of data compromise is a merchant's or a service provider's encoding of sensitive information on the card's magnetic stripe in violation of the PCI Data Security Standard. The other four are related to IT security, which can be improved simply by following common-sense guidelines."
Here is the report
on the U.S. Chamber of Commerce site (PDF).