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Basic Linux securities for beginners are more important for the system or Internet users to secure their system data from the hackers. Linux security users have a few inbuilt advantages more their equals like the Windows users in case of security.  Linux is much secure and effective than the Windows based systems. However, the Linux systems have the less frequently instead of the Windows systems.  On the other hand, many users have focused to disconnect the network connection, switched off from their system for better security reasons. These processes may some how secure but it is not a long term solution that every user faces to protecting servers from the outside intrusion.

Now day’s there are many computer systems connecting with the Internet directly or through the local area networks. So, it is much difficult or expensive for the user to make any sorts of change in their system setting for the security reasons. However, the user can avoid the security problem from their without disconnect the network connection from their system only by the proper planning and change the system configuration to create a better security environment. In this regard, the users only want to follow the basic Linux security for beginners. It comes in 2 basic flavours: the host integrity verification, as well as network intrusion detection. The host inegrity verification system that makes snapshot of critical files on the system: configuration files in /etc, binary program files in the /bin, /sbin, /lib as well as under /usr, the critical files in /var, many more. In order, to do this, that records fingerprint for every file: file pathname, date or time stamps, size, permissions and ownership, inode number as well as most importantly – MD5 of file’s contents.

That stores all information in digitally signed database, then runs the periodic checks and see in case, anything has changed. Obviously, in case, it has, then you know somebody is of no good. Examples of the host integrity verification include Tripwire that is included in a lot of distributions & AIDE. Both of these have to get set up before hand of system to be exposed to shark infested waters of Internet, but; in case, you have not prepared before hand and you are also concerned your system may have the root kit to be installed, then try to chkrootkit.