Data Insecurity (Editor's Note: This is the first of a 10-part series by noted electronic-payments-industry analyst Steve Mott on the current crisis in transaction security?its causes, its costs, and its possible solutions?ranging from the point of sale to the Internet to mobile commerce. After eight weekly articles, the series moves …

Hackers frequently go free, but Coventry, R.I., police late Monday night arrested four California men suspected in the recent theft of debit and credit card data from PIN pads at grocery-store chain Stop & Shop Supermarket Cos. While the arrests are certainly good news to Stop & Shop and banks, …