Computer Security

About two hundred years before, the word "computer" started to appear in the dictionary. Some people even didn't 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.
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 customer's 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 M.I.T. 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 up a good security system to protect the data in the computer. The most important thing is that we cannot allow those hackers and criminals entering our computers. It means that we need to design a lock to lock up all our data or using identification to verify the identity of someone seeking access to our computers.
The most common method to lock up the data is using a password system. Passwords are a multi-user computer system's usual first line of defense against hackers. We can use a combination of alphabetic and number characters...

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