A New Twist in Computer Security Tools

Intrusion-detection systems that actively ward off outside cyberattacks are becoming increasingly popular -- though still rather complex

Until now, the household words in Internet security have been antivirus and firewall. Antivirus software has long been a staple for consumers and corporations trying to avoid contamination from nasty bugs such as the I Love You virus that made the rounds in May, 2000, and the SirCam virus, which struck in the summer of 2001.

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