[from the analogy with biological viruses] A cracker program
that searches out other programs and 'infects' them by embedding
a copy of itself inside, so that they become a Trojan. When
these programs are executed, the embedded virus is executed as
well, thus propagating the 'infection'. This normally happens
invisibly to the user. Unlike a worm, a virus cannot infect
other computers without assistance from the cracker. [a type of
malware] Undetected software that can be installed on computers
which collects small pieces of information on users without
their knowledge. Typically, spyware is secretly installed on the
user's personal computer with similar malicious software such as
keyloggers by the owner of a shared, corporate, or public
computer on purpose in order to secretly monitor other users.
[coined by MIT-hacker-turned-NSA-spook Dan Edwards] A malicious,
security breaking program that is disguised as something benign,
such as a directory lister, archiver, game, picture, or even a
program to find and de