1. Introduction

The incredibly fast development of the Internet has brought many benefits both to consumers and businesses. 

However, it has also provided criminals or misguided individuals with great opportunities for crime or 'mischief'. 

The Internet is not only used by innocent members of the public, but also by fraudulent traders, software pirates, hackers and con-artists, to name but a few.

You have probably heard of "hackers" who nearly started World War III (or was that the film WarGames?) or others who gave themselves massive pay rises. Or how about the 'Love Bug' virus that crippled many multinational companies' e-mail systems? These are just some of the problems that networked computers can bring!