Cyber attacks on American corporations now average one a week and hackers in recent months have targeted Mastercard, Visa and Amazon. <br /><br />A survey of fifty large US companies found they spent 56 per cent more on cyber security this year.<br /><br />Some companies are headhunting for what they call e-security consultants. <br /><br />As Al Jazeera's Kristen Saloomey reports, many of them are former hackers.
