sfick (simple file integrity checker) is a system that assists system administrators with the process of verifying the integrity of critical files. Given a system compromise, system administrators must be able to verify the integrity of any files they designate as critical and, if such files have been modified in any way, have the ability to restore an original copy of such a file. It stores backup copies of files designated as critical along with verification information to write-once media such as a CD-R.
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