| FAQ Article: What is a trojan/worm/virus/logic bomb? |
This is excerpted from: Computer Security Basics by Deborah Russell and G.T. Gengemi Sr.
Trojan: An independent program that appears to perform a useful function but that hides another unauthorized program inside it. When an authorized user performs the apparrent function, the trojan horse performs the unauthorized function as well (often usurping the priveleges of the user).
Virus: A code fragment (not an independent program) that reproduces by attaching to another program. It may damage data directly, or it may degrade system performance by taking over system resources which are then not available to authorized users.
Worm: An independent program that reproduces by copying itself from one system to another, usually over a network. Like a virus, a worm may damage data directly, or it may degrade system performace by tying up system resources and even shutting down a network.
Logic Bomb: A method for releasing a system attack of some kind. It is triggered when a particular condition (e.g., a certain date or system operation) occurs.
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Posted on: 19-08-1999
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