Employees cause employers the biggest security headaches, according to research commissioned by Oracle.
The report reveals that while UK corporates are on top of the external threats posed by viruses and hackers, they find it difficult to tackle internal threats.
According to the reports' figures, internal security breaches present the largest threat to compromising data within a company.
More than half of the 100 companies surveyed felt internal security breaches were a bigger threat to their business than external ones.
Smaller companies were much more conscious of the internal threat than larger companies and were more likely to have systems in place to deal with it.
One of the surprise findings was the number of companies that were fooling themselves on the amount of time it took to fix a security breach.
While 50 per cent of companies surveyed stated that their systems are down foran average of between 30 minutes and three hours during a security breach, more than 61 per cent believed they could respond and fix a problem within an hour.
Chris Baker, vice president ebusiness, Oracle who commissioned the research, said this demonstrated a clear discrepancy in how quickly companies think they deal with the threat compared to how long their systems are actually unavailable.
He said that securing corporate data is tougher than ever. A huge 52 per cent of companies still find it difficult to keep data secure, while only 15 per cent think it is not difficult to safeguard information.
Baker also saw some positive trends in the figures. "It's encouraging to see that security is so high up the agenda for UK businesses. Recent years have seen an abundance of high profile virus and hack attacks and security has slowly crept up the IT managers to-do list," he said.
But he added that the research demonstrates that companies now need to switch their focus to the dangers within the firewall.
"The internal threat is essentially a people problem." he said. "People are naturally curious, and if they know confidential information is stored on the network, some of them are going to try to access it."
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