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Last month, more than 100 million online accounts were affected by the hacking of Sony’s PlayStation Network gaming service and other online services.

Companies have gotten better at detecting attacks through so-called “intrusion software” that uncovers odd behavior on networks, said Alfred Huger, vice president of development at security firm Sourcefire. As recently as five years ago, Huger said, it was difficult for companies to even determine if they were being hacked.

Even with enhanced technology to fight cyber espionage, experts say it will continue and evolve.

Rich Mogull, analyst and CEO of Phoenix-based security research firm Securosis, noted that governments and defense agencies have been spying on each other throughout history. Computers have just made it easier to do so electronically.

“This is just what countries do,” he said. “It’s the unfortunate reality of how the world works.”

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Baldor reported from Washington.