Contributed by jose on from the filesystem-security dept.
It creates a database from the regular expression rules that it finds from the config file. Once this database is initialized it can be used to verify the integrity of the files. It has several message digest algorithms (md5,sha1,rmd160,tiger,haval,etc.) that are used to check the integrity of the file. More algorithms can be added with relative ease. All of the usual file attributes can also be checked for inconsistencies.This is a useful way to ensure your servers remain intact and secure. Aide is available in the ports tree. You may also want to look at mtree , which comes in the base system and can be used for similar purposes.
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