Data Breach Costs Drop

The business cost of individual data breaches is decreasing. Notably, the average cost of a breach declined by 24%, from $7.2 million in 2010 to $5.5 million in 2011.

That finding comes from the seventh annual U.S. Cost of a Data Breach report from Ponemon Institute and Symantec Research. The study examined the 2011 data breach experiences of 49 U.S.-based organizations and interviewed a total of 400 people with direct knowledge of the IT, information security, and data breach cleanup efforts at those organizations.

It's the first time that researchers have ever seen data breach costs decline. What's behind the shift? According to the Ponemon report, researchers saw a 10% decrease in the per capita cost of breaches, which includes the cost of investigating breaches. They also saw the average size of data breaches decrease by 16% and "abnormal churn"-- customers who defect over data breaches--decrease by 18%.

"We find that companies who are not able to manage your data are viewed as less trustworthy," said Larry Ponemon, chairman and founder of the Ponemon Institute, in an interview. That's especially true for heavily regulated organizations, including financial services and healthcare organizations, which customers tend to hold to a higher standard. As a result, those industries have higher breach costs than normal since replacing lost customers is expensive.

[ From Sony to Nasdaq, read about some of the most significant corporate data breaches in 2011. See 6 Worst Data Breaches Of 2011. ]

But in an era in which the number of breaches--and often their severity--seems to be increasing, the overall decrease in customer churn resulting from breaches suggests that the average consumer may be facing data breach notification burnout. "Maybe people are numb to data breaches," said Ponemon. "There are still many people who care deeply about it, but maybe there are more people worried about the economy, their job security, or the state of gas prices."

The study also found that the number of data breaches that were caused by malicious attacks increased from 31% in 2010 to 37% in 2011. The leading cause (in 50% of cases) was malware, followed by malicious insiders (33%), device theft (28%), SQL injection (28%), and phishing attacks (22%). Interestingly, 17% of all data breaches also involved social engineering attacks. "We think about the evil hacker, which is pretty serious stuff, but in our study, we find that it's really the malicious insider--someone who's nefarious or angry at the organization--that presents the real danger to the company," said Ponemon.

Beyond malicious attacks, meanwhile, 39% of data breaches in 2011 were caused by negligent insiders, and 24% by system glitches.

Another factor behind the decreased cost of data breaches is that businesses' detection costs decreased by 6% from 2010, to an average of $428,330 per incident in 2011. "We think that companies are more efficient in investigating the data breach and organizing themselves around their incident response plan," said Ponemon. In the same time period, however, notification costs did increase by 10%, to $561,495 per incident, which he ascribed to businesses wanting to ensure that they remained compliant with states' more stringent notification rules.

The report found that there are a number of ways that organizations can better control their data breach costs. Notably, companies that have a CISO who is responsible for data protection and outside consultants to assist with the response saw reduced costs, in large part because these companies had the right policies and procedures in place, including a data breach response plan. "It helps the organization manage their team and not do extraneous things, like having two or three different parts of the organization hiring different forensic teams to conduct the investigation," said Ponemon.

But breach costs went up when the data was exposed by a third party or a lost or stolen device. This increase is due to the difficulty of conducting a forensic examination, especially for businesses that failed to keep up-to-date backups.

Another cost hit came from organizations that responded rapidly to breaches and quickly notified affected customers. "A lot of companies, believe it or not, over-report their data breach because they just want to get rid of it," said Ponemon. But in numerous cases, he said, businesses ended up over-reporting the scope of their breach--sometimes by a factor of five or 10. The lesson: sometimes it's prudent to let breach investigators finish their job before alerting customers.

The biggest threat to your company's most sensitive data may be the employee who has legitimate access to corporate databases but less-than-legitimate intentions. Follow our advice in our Defend Data From Malicious Insiders report to mitigate the risk. (Free registration required.)