What Is A Trojan Horse?
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A Trojan horse is:
- An unauthorised program contained within a legitimate program. This unauthorised program performs functions unknown (and probably unwanted) by the user.
- A legitimate program that has been altered by the placement of unauthorised code within it; this code performs functions unknown (and probably unwanted) by the user.
- Any program that appears to perform a desirable and necessary function but that (because of unauthorised code within it that is unknown to the user) performs functions unknown (and definitely unwanted) by the user.
The Trojan Horse got its name from the old mythical story about how the Greeks gave their enemy a huge wooden horse as a gift during the war. The enemy accepted this gift and they brought it into their kingdom, and during the night, Greek soldiers crept out of the horse and attacked the city, completely overcoming it.
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