Excerpt from NBC News story:
Data security expert Timothy Carone, a professor at the University of Notre Dame's Mendoza College of Business, told NBC News these types of breaches can happen to any company.
"It is an arms race. Things like this are going to happen to the best in the business," he said. "I don't believe it is because Yahoo has been lax or has not taken this sort of thing seriously -- it could have every easily been someone else."
Read the entire story on the NBC News website.