2. Target data breach began with a phishing attack
The huge data breach that affected 110 million customers in 2013 is thought to have stemmed from a phishing attack.
The breach is likely to have been initiated through Fazio Mechanical Services (FSM), a heating, ventilation and air conditioning contractor in Pittsburgh. The firm was connected to Target's systems to provide electronic billing services, contract submissions, and project management services.
Reports suggest that network credentials were stolen in an email malware attack at FSM that began at least two months before thieves started stealing card data from thousands of Target cash registers.
The breach cost Target hundreds of millions of dollars, and the firm fired its CEO and CIO. CIO Beth Jacobs (pictured), was accused of knowing about the flaws in her department, but doing too little to minimise the risks, while CEO Gregg Steinhafel was criticised for taking computer security too lightly.
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Not the biggest fish out there
Redmond says figure is closer to the five million mark