Hackers have broken into some of the world's most powerful computer clusters in recent weeks in an apparently coordinated cyberattack targeting research and academic institutions.
Although officials sought to play down the seriousness of the threats, some security experts warned that such a break-in could potentially enable a serious attack on the Internet.
Stanford University, the San Diego Supercomputer Center and the University of Illinois' National Center for Supercomputing Applications were among the systems hit.
Also affected was TeraGrid, a government-funded effort to link together several supercomputers, including those at San Diego and NCSA, so scientists can better crunch data for weather forecasting, astronomy and medicine.
'There's been some unauthorised access, but it's not that anything has been damaged or taken over,'' said Catherine Foster of Argonne National Laboratory, home to TeraGrid's coordinator. 'This seems to be part of an effort (by hackers) to gain merit badges.''
Foster said some TeraGrid computers had to be taken offline while security upgrades were made, disrupting research. She said the attacks begin in March and that all systems should be restored by week's end.
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