Target CEO Gregg Steinhafel resigned after massive data breach led to his ouster. The breach was “the straw that broke the camel’s back,” Gartner analyst Avivah Litan says. Since then, CEOs have built closer ties to chief security officers, often having CSOs report directly to them. Litan: “There’s been a sea change in attitude among C-level executives in the last year” in the retail industry. CIOs should be invited to business development discussions to get the security implications of decisions, analyst says.”]