APLawrence.com -  Resources for Unix and Linux Systems, Bloggers and the self-employed

2003/09/06 virus, worm, trojan


© September 2003 Tony Lawrence

A virus is a computer program that infects other programs. That's different from a worm, which simply propagates itself from computer to computer by *temporarily* using some other program. A Trojan is a program that pretends to be something it is not.

Think of it this way. Your pal Bill has a spare key to your house. A worm would either steal the key to let itself in (where it would then presumably find other keys to steal) or sneak in behind Bill while he was feeding your goldfish. A virus would take control of Bill's body and make him open the door. Bill would otherwise function normally, though he might twitch and fall down now and then, either because the virus wanted him to or just because it screws him up in other ways. A Trojan would be someone else dressed up to look like Bill who you then hand another spare key to. The fake Bill might then become a virus, but he started out as a Trojan.


Got something to add? Send me email.





(OLDER)    <- More Stuff -> (NEWER)    (NEWEST)   

Printer Friendly Version

->
-> virus, worm, trojan


Inexpensive and informative Apple related e-books:

Take Control of Upgrading to El Capitan

Take Control of iCloud

Take Control of Preview

Take Control of OS X Server

Are Your Bits Flipped?




More Articles by © Tony Lawrence




Printer Friendly Version

Have you tried Searching this site?

This is a Unix/Linux resource website. It contains technical articles about Unix, Linux and general computing related subjects, opinion, news, help files, how-to's, tutorials and more.

Contact us


Printer Friendly Version





Securing a computer system has traditionally been a battle of wits: the penetrator tries to find the holes, and the designer tries to close them. (Gosser)




Linux posts

Troubleshooting posts


This post tagged:

Security

UnixWords



Unix/Linux Consultants

Skills Tests

Unix/Linux Book Reviews

My Unix/Linux Troubleshooting Book

This site runs on Linode