... send a flood of coffee toward a personal computer. The hard disk of the computer could be endangered by the flood of coffee. Besides, human caretaker of computer system can cause as much as harm as any physical hazard. another example, a cashier in a bank can transfer some money from one of his customer's account to his own account. Nonetheless, the most dangerous thief is not those who work with computer every day, but youthful amateurs who experiment at night --- the hackers. The term "hacker "may have originated at M.I.T. as students' jargon for classmates who laboured nights in the computer lab. In the beginning, hackers were not so dangerous at all. They just stole computer time from the university. However, in the early 1980s, hackers became a group of criminals who stole information from other peoples' computer. For preventing hackers and other criminals, people need to ...

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