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Word Count: 2,483
About two hundred years before the word computer started to appear in the dictionary Some people even didnt know what is a computer However most of the people today not just knowing what is a computer but understand how to use a computer Therefore computer become more and more popular and important to our society We can use computer everywhere and they are very useful and helpful to our life The speed and accuracy of computer made people felt confident and reliable Therefore many important information or data are saved in the computer Such as your diary the financial situation of a oil company or some secret intelligence of the military department A lot of important information can be found in the memory of computer So people may ask a question Can we make sure that the information in the computer is safe and nobody can steal it from the memory of the computer Physical hazard is one of the causes of destroying the data in the computer For example 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 For example a cashier in a bank can transfer some money from one of his customers account to his own account Nonetheless the most dangerous thief are not those who work with computer every day but youthful amateurs who experiment at night --- the hackers The term hacker may have originated at MIT as students jargon for classmates who labored nights in the computer lab In the beginning hackers are 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 steal information from other peoples computer For preventing the hackers and other criminals people need to set
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