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Len de Villiers, Telkom’s chief information officer, says he enjoys a challenge. He says, too, that he’s a sucker for punishment. He’s certainly taking on a big challenge – and a punishing one – in

In the cyber-espionage thriller Blackhat (2015), Chris Hemsworth plays a computer hacker who is freed from prison to trace a blackhat hacker – someone who breaches computer security with either malicious intent or for personal gain. As often