Computer Security

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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 ...

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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.
Generally, identity can be established by ...

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