A spate of high-profile cybercrimes and data leaks in recent months has left companies wondering if they will be next. They worry about the safety of their computer networks as hackers devise new ways to penetrate traditional defenses.

Companies are spending more on protecting their information but are also dragging their heels in taking radical action.

"Maybe 10 years ago, you could be safe and secure if you had security software installed on your computer," said Motohiro Nakanishi, an IT security researcher at the government-backed Information-technology Promotion Agency (IPA). "The situation has changed dramatically since then."