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A computer
program is either hidden inside another program or that
masquerades as something it is not in order to trick potential
users into running it. For example a program that appears
to be a game or image file but in reality performs some
other function. The term "Trojan Horse" comes from a possibly
mythical ruse of war used by the Greeks sometime between
1500 and 1200 B.C.
A Trojan
Horse computer program may spread itself by sending copies
of itself from the host computer to other computers, but
unlike a virus it will (usually) not infect other programs.
See also:
Virus,
Worm
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