Security in Linux operating system.

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Linux operating system is one of the most secured operating systems. It provides different feature to protect our system like password protection, networking filtering , security audits, etc. The most fundamental security tool of any operating system is password protection.

• Password protection:

Password protection is very popular feature now a days. Choosing good password is the first and most necessary step for having a security system. You must remember these points while choosing a password.

•Do not use your login name or your name.

•Do not use proper names of any kind .

•Do not use strings that you can forget very easily or noted it down at a secured place.

•Do not use any contiguous letters on the key board.

•Avoid using combination of capital and small letter .

you can change your password periodically. For this , you can set an expiration data Linux password by using Change command.

Example-

To set the password expiration so that user. Harshit is prompted to change his password ever N number of days , you would log in as root any type the following command.

#Change -M N Harshit

Here M parameter tells the change command that you are setting the maximum N number of days to keep the password.

The instillation program will prompt you to set a root password for your system. The root password must be of maximum six character long, the password you type is not echoed to the screen . You must enter a password twice ,if both the password couldn't match ,the instillation program will ask you to enter them again. Remember that the password is case sensitive . write down the password and keep it in a secure place .The root user has complete access to the entire system for this region , logging  in as the root user is best done only to perform system maintenance or a administration.

By- Harshit kumar...