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Backdoors were originally (and sometimes still are) nothing more than methods used by software developers to ensure that they could gain access to an application even if something were to happen in the future to prevent normal access methods.

Common backdoors include NetBus and Back Orifice. Both of these, if running on your system, can allow an attacker remote access to your system—access that allows them to perform any function on your system. A variation on the backdoor is the rootkit.

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