There are fears students in California may have been the victims of identity thefts after hackers accessed personal data.
More than 1100 new students at the University of California Davis School of Veterinary Medicine found data in their accounts such as names, birth dates and social security numbers had been accessed last month.
There are also reports that data from 375 students from the 2004-2005 class may have been hacked into.
The university had anti-virus, anti-trojan and other applications in place, but did not have behavioural analysis software.
Geoff Sweeney, CTO of IT security firm Tier-3, said this might have spotted unusual activity such as students accessing their accounts before they had started at the university.
He added that the different types of threats facing modern IT managers are now so varied that a safety net approach - using behavioural analysis software - is now required to secure an IT system from the various attacks by today's hackers.
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