Authorities in the US and Europe are investigating hacks into US military and NASA networks last year, along with a major breach at Cisco Systems, where programming instructions for the company’s networking products were stolen.
Swedish authorities are currently questioning a 16-year-old boy who is suspected of being involved.
The hacks go back to last spring and include the theft of the Cisco programming instructions, which were then posted on a Russian website for other potential hackers to view.
The instructions could have enabled hackers to more easily breach Cisco customers’ networks, although the company says it is not aware of any attacks relating to the theft.
US authorities say the hacks were achieved via a maze of computers located around the world, and involved the theft of log-in and password details from a variety of computer users, to allow those involved to get central control of important networks.