Worms and viruses are increasingly being written to steal confidential data from innocent people’s computers, to hijack resources, or launch spam or denial-of-service attacks.
The first computer virus (Elk Cloner) written nearly thirty years ago was relatively harmless and almost funny. Its intention was to display a poem every time your computer booted up. Today’s cyber-crime is big business and often malicious. It comes in many forms, from viruses and phishing to spam. Emails and web downloads are the most common source of viruses. In this chapter we cover: