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In the next few months hackers will try to penetrate the cyber defenses of Britain's major banks and steal information about millions of customers. But for once they'll be welcome. Banks are on red alert after cyber criminals obtained details of 83 million clients from JPMorgan Chase this year and Britain's leading lenders have signed up for tests that let teams of certified hackers attack at will. The cyber war games will mark a major escalation in how banks test defenses in a high-stakes battle with criminals. "It's the first time that banks are having their systems tested for security threats in a live environment as opposed to a simulated or isolated one," said Stephen Bonner, a partner in the cyber security team at KPMG. Cyber crime costs the global economy $445 billion a year and the bill is rising, according to the Center for Strategic and International Studies (CSIS), which said it damages trade, competitiveness and innovation across industries. Banks are particularly vulnerable, despite spending hundreds of millions of dollars a year on cyber defenses. Increasingly sophisticated criminals are trying to steal money or client data, cause havoc in financial markets or score political points.