Protecting A Computer

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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 ...

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criminals. One of the three card-key is called watermark
magnetic. It was inspired by the watermarks on paper currency.The card's
magnetic strip have a 12-digit number code and it cannot be copied. It can store
about two thousand bits in the magnetic strip. The other two cards have the
capability of storing thousands of times of data in the magnetic strip. They are
optical memory cards (OMCs) and Smart cards. Both of them are always used in the
security system of computers.

However, it is not enough for just using password system and card-keys to
protect the memory in the computer. A computer system also need to have a
restricting program to verify the identity of the users. ...

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