A look at some of the most vulnerable organizations

AMSTERDAM: The first half of 2015 witnessed a 10 percent rise in data breaches compared to the same period last year.

The largest breach in the first half of 2015-which scored a 10 in terms of severity on the Breach Level Index (BLI)-was an identity theft attack on Anthem Insurance that exposed 78.8 million records, representing almost a third (32 percent) of the total data records stolen in the first six months of 2015.

Other notable breaches during this analysis period included a 21-million-record breach at the US Office of Personnel Management (BLI: 9.7); a 50-million-record breach at Turkey's General Directorate of Population and Citizenship Affairs (BLI: 9.3); and a 20-million-record breach at Russia's Topface (BLI: 9.2). In fact, the top 10 breaches accounted for 81.4 percent of all compromised records.

Cold stats:

The number of state-sponsored attacks accounted for just 2 percent of data breach incidents, but the number of records compromised as a result of those attacks totalled 41 percent of all records exposed, due to the breaches at Anthem Insurance and the US Office of Personnel Management. While none of the top 10 breaches from first half of 2014 were caused by state-sponsored attacks, three of the top ten this year were state sponsored - including the top two.

At the same time, malicious outsiders were the leading source of data breaches in the first half of 2015, accounting for 546 or 62 percent of breaches, compared to 465 or 58 percent in the first half of last year. Forty-six percent or 116 million of the total compromised records were attributable to malicious outsiders, down from 71.8 percent or 298 million in 2014.

Data breaches by type:

Identity theft remained the primary type of breach, accounting for 75 percent of all records compromised and slightly more than half (53 percent) of data breaches in the first half of 2015.

Five of the top ten breaches, including the top three-which were all classified as Catastrophic on the BLI - were identity theft breaches, down from seven of the top 10 from the same period last year.

Data breaches by industry:

Across industries, the government and healthcare sectors accounted for about two-thirds of compromised data records (31 percent and 34 percent respectively), though healthcare accounted for 21 percent of breaches this year, down from 29 percent compared to the same period last year.

The retail sector saw a significant drop in the number of stolen data records, accounting for 4 percent compared to 38 percent for the same period last year.

Data breach by regions:

Across regions, the US represented the largest share with three-quarters (76 percent) of data breaches and nearly half of all compromised records (49 percent). Turkey accounted for 26 percent of compromised records, with its massive GDPCA breach in which 50 million records were breached by a malicious outsider.

The level of encryption used to protect exposed data—which can reduce the impact of data breaches-increased slightly to 4 percent of all breaches compared with 1 percent in H12014.

Some findings:

Gemalto, a provider of digital security, has released the findings of the Breach Level Index for the first six months of 2015, revealing that 888 data breaches occurred, compromising 246 million records worldwide.

Compared to the first half of 2014, data breaches increased by 10 percent while the number of compromised data records declined by 41 percent during the first six months of this year. This decline in compromised records can be attributed to that fact that fewer large scale mega breaches have occurred in the retail industry compared to the same period last year.

Despite the decrease in the number of compromised records, large data breaches continued to expose massive amounts of personal information and identities.

"What we're continuing to see is a large ROI for hackers with sophisticated attacks that expose massive amounts of data records. Cyber criminals are still getting away with big and very valuable data sets. For instance, the average healthcare data breach in the first half of 2015 netted more than 450,000 data records, which is an increase of 200 percent compared to the same time last year," said Jason Hart, Vice President and Chief Technology Officer, Data Protection, Gemalto.

"While the number of data breaches fluctuates, it's still clear that breaches are not a matter of 'if' but 'when.' The Breach Level Index data shows that most companies are not able to protect their data once their perimeter defences are compromised. Although more companies are encrypting data, they are not doing it at the levels needed to reduce the magnitude of these attacks," he added.