Back Doors

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A back door is an unauthorized method of access. Once a hacker has access to a system, he will want to be able to continue to have access to that system even if he is discovered . To do this he will unlock a number of back doors. Back doors create an alternate method of gaining access if the primary access is cut off. The term back door is also used to indicate alternate methods of accessing data through back doors in application code.

Most back doors can be discovered if you do regular auditing of the integrity of the programs and configuration files on your system. A program that compares the current state of a file to a known good state of the file should detect any planted back doors. This program needs to validate the file's permissions, owner, group , size , and a digital signature using a strong cryptographic algorithm.

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