Glaswegian

Computer users dream of security software that provides perfect but invisible protection against hackers and other cybercriminals.

This fantasy program never slows your computer down or asks you annoying questions. It just works in the background.

Dave DeWalt would love to sell it to you, but seven months after taking the helm of computer security firm McAfee, he knows he'll never sell you anything quite that good.

"Every time the good guys figure out how to defend against one kind of attack, the bad guys think up something else," he said. "There will never be one perfect defense. There will only be an endless arms race."


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