Stuxnet raised the fear of cyber-attack. The recently discovered computer virus called Duqu Trojan, which contains some Stuxnet code, is built to steal information about computers controlling industrial palnts. IT security experts suspect Duqu came from the same source as Stuxnet, and may be seeking weak points for future attack.

　　Despite all this activity, the nature of cyber-threats remains unclearly described. Experts have been warning for years about dangers of being attacked in US government and private computer networks. In 2009, Obama launched a 60-day cyberspace security review to assess the threats. It concluded they were horrible, and urged the government to figh the threat under the direction of the US National Security Council, along with cooperation with other countries and private industry.

　　Firewalls guarding US military(军事) information are attacked mercilessly, sometimes successfully. “Over the past decade, large quantities of data have been taken out by foreign hackers,” then US vice defense secretary William Lynn said in July. A single such attack in March saw 24,000 files stolen. Yet cyber-war goes far beyond this activity. There is industrial spying; criminal attacks, including stealing military secrets; and selling fake military parts on the internet, which can damage or destroy equipment. Opposition groups create their own threats. Thus security must go far beyond protecting government documents and facilities.

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