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Which of the following requires a special series of input or specific user IDs in order to activate?
Backdoors
Worms
Trojans
Keyloggers
Backdoors are put in place at secret locations in programs, and can be activated when a certain series of characters are pressed or someone logs in from particular user ID. Edit: nobody uses the term "Trapdoor", we call them "Backdoor" -- Edit: the question is misleading. It is not required for a backdoor to have any special series of input of a specific user ID, though this is common. It's also possible to establish a permanent backdoor that does not require any of these.
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