TalkTalk joins a lengthening global list of companies that have suffered major data breaches, including Ashley Madison, eBay, AOL, Target, Home Depot, Sony, Anthem and JPMorgan Chase.
Google and McAfee estimate there are 2,000 cyber-attacks every day around the world, costing the global economy about £300bn ($460bn) a year.
Yet more than two thirds of firms say they feel inadequately protected against increasingly sophisticated hackers looking to extort money through blackmail or steal data to sell on the black market.
So what should businesses be doing to improve their security? Technology of Business canvassed cybersecurity experts for their views.
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