Definition: A backdoor is a secret or undocumented means of getting into a computer system. Many programs have backdoors placed by the programmer to allow them to gain access to troubleshoot or change the program. Some backdoors are placed by hackers once they gain access to allow themselves an easier way in next time or in case their original entrance is discovered.
Backdoor
From Tony Bradley, CISSP-ISSAP, for About.com
Explore Internet / Network Security
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