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5 definitions found
 for Trojan horse
From The Collaborative International Dictionary of English v.0.48 :

  Trojan horse \Tro"jan horse`\, n. [from the incident described
     in Homer's Iliad.]
     1. (Classical mythology) a large hollow wooden horse built by
        Greek soldiers besieging Troy during the Trojan War, and
        left as a "gift" when they pretended to abandon their
        seige. It was taken into the city by the Trojans, and
        Greek soldiers concealed inside came out and opened the
        gates to the city, enabling the capture of the city by the
        Greeks.
        [RP + PJC]
  
     2. Hence, any thing or person which appears harmless but is
        designed to destroy or attack from within. It may
        sometimes refer to a group; -- see also fifth column.
        [RP + PJC]
  
     3. (Computers) A computer program designed to evade the
        security precautions within a computer system and perform
        illicit operations, or to do malicious damage, and often
        designed to look like a different kind of program, such as
        a game, archiver, or directory lister. This term is not
        applied to a program that replicates itself, such as a
        virus.
        [RP + PJC]

From The Collaborative International Dictionary of English v.0.48 :

  fifth column \fifth` col"umn\, n. [from a statement during the
     Spanish Civil War (1936) that the Falange had four columns of
     soldiers marching on the city, and a fifth column "already
     there" (i.e. sympathizers inside the Republican lines).]
     1. a group of persons inside the battle lines of a territory
        engaged in a conflict, who secretly sympathize with the
        enemy, and who engage in espionage or sabotage; --
        sometimes also referred to as a trojan horse.
        [RP]
  
     2. Hence, any faction of persons within a group who secretly
        sympathize with an enemy, especially those who engage in
        activities harmful to the group; an enemy in one's midst;
        a group of traitors.
        [RP]

From WordNet (r) 3.0 (2006) :

  Trojan horse
      n 1: a subversive group that supports the enemy and engages in
           espionage or sabotage; an enemy in your midst [syn: fifth
           column, Trojan horse]
      2: a program that appears desirable but actually contains
         something harmful; "the contents of a trojan can be a virus
         or a worm"; "when he downloaded the free game it turned out
         to be a trojan horse" [syn: trojan, trojan horse]
      3: a large hollow wooden figure of a horse (filled with Greek
         soldiers) left by the Greeks outside Troy during the Trojan
         War [syn: Trojan Horse, Wooden Horse]

From The Jargon File (version 4.4.7, 29 Dec 2003) :

  Trojan horse
   n.
  
      [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, or (in one notorious 1990 case on the
      Mac) a program to find and destroy viruses! See back door, virus, worm
      , phage, mockingbird.
  

From The Free On-line Dictionary of Computing (18 March 2015) :

  Trojan horse
  trojan
  
      (Or just "trojan") A term coined by
     MIT-hacker-turned-NSA-spook Dan Edwards for a malicious,
     security-breaking program that is disguised as something
     benign, such as a directory lister, archiver, game or (in one
     notorious 1990 case on the Mac) a program to find and destroy
     viruses!  A Trojan horse is similar to a back door.
  
     See also RFC 1135, worm, phage, mockingbird.
  
     [{Jargon File]
  
     (2008-06-19)
  

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