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Answer Posted / dharu
A trap door is a hidden software or hardware mechanism that allows systems controls to be circumvented. In general it's a malicious code that allows unauthorized access to a computer system or network by accepting remote commands from an attacker elsewhere on the Internet. Trap door software listens for commands on a certain Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) port.
Trap-doors allow attackers to execute remote commands and install other software, which may in turn compromise passwords or other personal data, or allow the machine to be used for further nefarious purposes. Remote access or trap/backdoor functionality is typically now included in most Trojan horses and bot programs. But a trap/backdoor may intentionally but ill-advisedly be included in legitimate software products to facilitate remote customer support, but become an exploitable vulnerability when discovered by malicious actors.
Let me suggest you to read more about Trap/Back door at:
http://itlaw.wikia.com/wiki/ Trap_door
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