At the end of 2013, on the busiest shopping day of the year, the US retailer Target was hacked. Early estimates suggested that the hackers stole the payment details of up to 40m credit cards. The number of customers potentially affected was later revised upwards to 110m - around one in every three Americans. Data breaches and denial of service attacks are now so commonplace that only the biggest breaches make the headlines.
The costs of these types of incidents, from business disruption to loss of consumer trust, can be significant, particularly for data-intensive industries such as technology, retail and financial services.
So, to what extent are companies prepared for their defences failing or an unforeseen mishap occurring?