Middle Eastern oil and gas companies have been targeted in massive attacks on their computer networks in an increasingly open cyber war where a new virus was discovered just this past week.
About 80 masked people, calling themselves allies of the global hacker group Anonymous, picked up litter in Tokyo Saturday in a novel protest against Japan's tougher laws against illegal downloads.
Oil giant Saudi Aramco said on Sunday that an August cyber attack on its computer network targeted not just the company but the kingdom's economy as a whole.
The Swedish government said on Thursday it planned to crack down on hackers, at a time when the sex assault allegations against WikiLeaks founder Julian Assange has made the country a target of repeated cyber attacks.
The White House said Thursday it was considering an executive order on cybersecurity after legislation on infrastructure protection failed again in the Senate.
An Islamist group on Tuesday said it will carry out new cyber attacks on US banking targets, according to SITE Intelligence Group, following similar attacks last week in response to an anti-Islam film.
Japan has been developing a virus that could track down the source of a cyber attack and neutralise its programme, the daily Yomiuri Shimbun reported Sunday.
A US financial industry group warned banks and other institutions to beware cyber attacks Wednesday, after some firms reported sporadic problems with their websites.
Lithuania's central bank said Friday it had been hit by a cyber-attack, but had eventually overcome the assault on its website and other online services.
US Attorney General Eric Holder has appointed prosecutors to lead two criminal investigations of high-profile leaks of classified national security information to the media.