The Blaster worm, which continues to create chaos by crashing numerous vulnerable Windows machines across the Net, has changed the rules on malicious code attacks. Unlike Slammer or Nimda, home users have borne the brunt of the attack - although businesses of all sizes have also suffered. Blaster shatters the partially reassuring notion that email-borne nasties are the most significant threat for Harry Homeowner. Now updating patches and using perimeter security, always good ideas, have become prerequisites for Windows users. With the appearance of new variants of Blaster already appearing on the Net, its worth reviewing the nature of Blaster,...