3. virus. Trojan horses, worms, time-bombs, viruses, and Internet:
. As an independent program which will reproduce by itself, increasingly in order to destroy the information or may make the computer run slower by secretly living memory or disk space, by knowing.
A Trojan horse: A Trojan horse is a legendary warrior who has been hiding in wooden horse to sneak into the city until it seized the city. This program is similar. Is this program will serve as unsolicited? It will often do what we don't want, and what it's doing. There is no required.
.Internet worm: created by Robert Morris, Jr., until it krachon to the world. It is a program that can reproduce by themselves even more from one system occupy a resource and make the system slow down.
Time bomb: Is the code, which will serve as a unique format encourages attacks. Work when the attack condition arrives. For example, the time bomb to destroy all the files in July 31, 1999.
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