'Quantum Dawn' tests Wall Street security

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A major cyber-hacking exercise is under way in the US involving some 50 banks. It's designed to test their ability to counter organised hacking attacks on their computer systems. We hear from a consultant who helps protect companies from attack. Also on the program, are the world's rich nations about to launch a coordinated crackdown on tax avoidance? We ask the Taxpayer's Alliance and the charity War on Want to discuss what can be done to combat tax avoidance. Plus, on his 95th birthday we report on Nelson Mandela's brand and ask if it has been exploited by his family.