Computer Security

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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 ...

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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. Generally,
identity ...

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