IT security glossary
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Trojan or Trojan horse
A malicious program that allows total intrusion into a computer virtually undetected by the victim and takes remote control of it.
VPN (Virtual Private Network)
A private extended area network established by creating permanent dedicated links between business networks through public networks in order to meet the resource-sharing needs of its users.
Virus
Small malicious program that fits into a legitimate computer program and infects it so that it can reproduce itself through it. Today, most viruses are worms.
Vulnerability
Level of exposure to IT threats.
Worm
Intrusive parasite program which nibbles a computer system’s resources: memory, bandwidth, etc.. A worm may act as a virus spreading from machine to machine or as a spy. It can also saturate a website, destroy data, etc.
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