Ex-Homeland Security Chief: Good cyber security is like an immune systemA rash of recent high-profile cyber attacks has security experts scrambling to find solutions. “You cannot have an unrealistic set of expectations and believe your system will never be penetrated,” Michael Chertoff, former Secretary of Homeland Security under George W. Bush, told Yahoo Finance at the annual Concordia Summit in New York City. Chertoff, who now runs his own risk management company, stressed that cyber security involves much more than code.

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