Former disgruntled employees are the biggest risk to network security in these troubled times. BARELY A WEEK goes by these days without a media report of hackers trying to break into a corporate IT system - and sometimes almost succeeding. In March this year, for example, one man was jailed for eight years and another for between three and four years for their part in a plot to steal ￡229m from the Sumitomo Mitsui Bank in London, UK.
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