A trap door is a quick way into a program that allows program developers to bypass all of the security built into the program now or in the future but can be exploited by criminals to gain unauthorized access to a system.
To a programmer, trap doors make sense. If a programmer needs to modify the program sometime in the future, he can use the trap door instead of having to go through all of the normal, customer-directed protocols just to make the change. Trap doors of course should be closed or eliminated in the final version of the program after all testing is complete, but, intentionally or unintentionally, some are left in place. Other trap doors may be introduced by error and only later discovered by crackers who are roaming around, looking for a way into system programs and files. Typical trap doors use such system features as debugging tools, program exits that transfer control to privileged areas of memory, undocumented application calls and parameters, and many others.
Kavungya answered the question on May 17, 2019 at 09:31
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